When I first went looking for information on how to paint Lil' Queeny's aluminum skin, you wouldn't BELIEVE what came up when I Googled "Paint Queeny Skin" :o
So I regrouped, and rephrased. At first I fell for it, and was just certain I indeed had at least five terminal illnesses with only 30 days left to live, and I thought, "man - I gotta shift into high gear". Then I caught my typo. Third time's the charm!
I searched "Paint vintage RV aluminum". What surprised me was that I didn't see a lot of hits on "Zinc Chromate". But a quick Wikipedia check for same, brought this up under the heading "Toxicity".
Recent studies have shown that not only is zinc chromate highly toxic, it is also a carcinogen.[13] Exposure to zinc chromate can cause tissue ulceration and cancer.[1][3] A study published in the British Journal of Industrial Medicine showed a significant correlation between the use of zinc chromate and lead chromate in factories and the number of cases in lung cancer experienced by the workers.[14] Because of its toxicity the use of zinc chromate has greatly diminished in recent years.
I said, "oh".
You see, back when I painted our FIRST RV in a friend's aircraft hangar (a 1954 13.5' canned ham starting with "S", but it wasn't Shasta - and I painted it bright white by the way - and Lil' Willy is a 1954 Willys - by the way too), I used Zinc Chromate primer on the bare aluminum spots. We bought that camper from an earlier neighbor for $100 down and $50 monthly payments until the grand total of $350 was paid off. Oh man - I gotta dig out film photos and post some of that someday. But, maybe because of the toxicity, I don't remember anything else about that paint job except that my buddy was so mad because I got some over-spray on his hangar floor (he was immaculate, with an epoxy white floor. He waxed the Cessna Skylane after every flight and parked with the wheels on carpet pads. We were chess partners).
No, no Zinc Chromate hits, but just about everything else under the sun! Professionals, and public and promos, Oh My! Try it, you'll see what I mean.
But spraying or rolling and automotive finishes and home aluminum siding, and water based and oil based, and expensive breathing apparatuses, and self-etching primer in a can and concrete driveways and paint on people's bodies - again!
I did watch one YouTube video that was pretty good (the same apparent professional who taught me to talk the talk of "scratch"). He recommended the MD-500 (about seven times in a row) even while showing the product MD-550 and MD-650 on it's right.
Now how am I, a do-it-yourselfer, supposed to remember stuff like MD-550? Especially when you are supposed to add up to hundreds of potential hardeners and additives and artificial sweeteners with names like F334NJ, 5FFF67, KLM-712, and BOEING-757?
I'm a home center kind of guy. I understand words like Valspar, Rustoleum, Sherwin-Williams and Behr (even if they CAN'T spell it right).
And you can name your DOG Rustoleum! Can't do that with MD-550 for crying out loud. That's just wrong. I mean picture this - you have to park the RV and take the flight for that one event. You take your dog to the kennel. You tell the first worker, "his name is MD-550" and you put it down on the paperwork. The worker says, "okay Em Dee Five Fifty, come with me" and all is good. Then the next shift comes on and looks over the paperwork for the new tenants and comes to YOUR dog and says, "here's your supper Em Dee Five Five Zero". and your dog looks blankly at the worker and goes to bed hungry because he thought it was for another dog! Same thing happens the next day AND at exercise time. Two weeks pass and when you get home your dog hates you! As Johnny Cash might say, "Cause he's the dirty rotten scoundrel who went and named me Em Dee Five Fifty".
So I was confused. Better talk to some professionals. My first stop was the airport Fixed Base Operator, the ones who employ aircraft air-frame and engine mechanics. Maybe one of them was skilled in painting aluminum. "No", said the lady at the counter, "we ship that kind of thing out".
Well after a few other thoughts and stops I swung by this professional paint supplier in town called Diamond Vogel. By this time I was really needing to find some facilities (that whole age thing you know?) and as I ran by the counter girl into that first door on the right I hollered, "I need to paint aluminum!" and clicked the lock.
By the time I got out, her and the other guy had this data sheet printed out for me and were espousing the grand benefits of a product called Finium.

It's a primer and top coat all in one - and my heart sunk. I thought, "the professionals are going to suggest a one product solution? For aluminum? Bare metal? Primer and paint in one? Water based?! Oh for crying out loud!", said my inner traditionalist. I wanted to shout, "don't you have any Zinc Chromate!", but I remained polite, if not somewhat dismissive. :R (Don't be mad guys, just keep reading.)
I wasn't going to go next door to Napa because the LAST time I was in there this counter-woman chewed me out, for nothing! It's not like I needed to use their bathroom or anything. BUT, the Diamond Vogel kids (I say that respectfully, because when you get to my age you start to call everyone kids - trust me, you'll do it too), mentioned it as an alternative and I was on empty, so I went over. The first guy told me after I described my conundrum, that I need to talk to Chuck. I waited in line and when it was my turn I told Chuck what was going down.
Do you remember that scene in Monty Python's Holy Grail when God comes out from behind the cloud and the choir starts singing? Well as Chuck spoke, that's what it felt like. A new day was dawning - and it was smiling on me!
Yes it was going to be kind of expensive, what with the recommended primer coat...

and the top-coat...

and the additives and sweetners, and the new equipment, but it was STILL gonna be less than three new access doors - or about the same. And to top it off - the data sheets he showed me said Imron. Imron - you know? "The wet look that lasts"! Granted it was Imron Industrial, but I found out later that it just makes it more durable than fleet truck Imron (you know - Kenworths and Peterbilts and stuff) at about half to a third of the cost!
Now anybody who was anybody in MY High School has heard of Imron (although we always pronounced in Emron - I think because an "Emerald image" popped into our heads during discussion), but the top of the line paint job for a High School car was Imron - not that any of us could afford it. But if you "talked the talk you could walk the walk" buddy, and in High School that was key.
My first paint job was enamel acrylic - I think. My brother-in-law did it. That is to say the husband of foam-rubber hair-do sister #1. Dark midnight blue metallic! Instant girl action!
His brother owned a body shop and for insurance reasons, I couldn't help. So I didn't get to remove the destroyed vinyl top, fill any of the damage, or sand down that terrible, awful, pitted hood and trunk paint. But the brother-in-law enjoyed it - I think.
It was a 1968 Camaro. I know! Lil' Queeny is a 1968! Still my all-time favorite car of all-time. Even if it was an Amoeba motor. For those of you who don't know, the Chevy small block V-8 was a Mouse motor, the big-block V-8 was a Rat motor and the inline six (mine was the smaller 230 CID) was an Ameoba motor. But it was still spunky. I mean, I could jump on the freeway on-ramp with four of us on board, in the rain, coming from a miniature-golf outing or something, and brody it out almost 360 degrees - on accident. But that was after the accident.
The accident was only 30 days after the paint job, a beautiful dark midnight blue with gold metal-flake, ohhhoho. I had been sitting in class all day watching the snow fall in the mountains - first of the season! When the last bell rang I drove home, grabbed my boots (I wasn't completely stupid) and threw them in the back seat. First day requiring snow tires or chains for the season, but that wasn't going to stop me.
By the time I got far enough up the canyon to not be able to make any more forward progress, I made a real slick three-point turn and headed back down. I got this handled! And how you gonna know how your wheels handle in less than perfect traction situations if you don't experiment? Just a bit of gas, there we go, back wheels break traction, turn slightly into the skid and it straightens right out. Except it didn't straighten right out. Then next thing I remember were rear-deck speaker covers hitting me in the back of the head and I was nose-down in the creek. Against a tree.
Well, I got a ride down to the canyon mouth where there was a phone booth and called the sheriff; they'd meet me right there. Then I called my other brother-in-law, husband of foam rubber hair-do sister #2, and he had a tow-truck owner friend who owed him a favor.
Brother-in-law #1 was more than gracious, so was the Deputy (he didn't ticket me for the snow tire thing). Everybody was so understanding. They knew what this meant and how I was punishing myself; even Dad didn't say much.
But I did get that car back on the road for only $100. No kidding, for a '68 Camaro! Front clip with one good fender (the one I needed and the front cross pieces) $40 (from a guy who had installed a Rat-motor and a Super Sport front clip, and who had a nice paint job AND a golden retriever named Camaro. Now that's a cool name for a dog!, $20 for a hood, $10 for a fan and $10 for a headlight and spray cans of primer grey and miscellaneous.
But the paint job was lost. And you know what primer grey does. Yup, the girl action dried up - after only 30 days. But that's okay, now I could afford that dirt bike! And I had to get a truck to haul it right? Yes - you guessed it - a 1968 Chevy half-ton long-bed with a 327 mouse motor! :) Cherry Red! (Not Imron). I actually sold that Camaro to buy my first Jeep. No Way! I am not shifting you! A 1968 Jeepster Commando, shackle lifted about four inches! With N78 Dayton Knobbies! Ohhhhoho.
Yes there's a recurring theme here. 1968 and 1954 must be my magic numbers. Well that and 11, but we don't have time to talk about that right now. I really should play the lotto.
And now, Napa Chuck was telling me I could have Imron on Lil' Queeny - and afford it! He showed me an aluminum hood scoop that had recently been sprayed. Beautiful! "But", said Chuck, you have to mask really good, this stuff gets on EVERYTHING!" I said, "Chuck, my garage is attached to the house. And I have a wife. And I'd like to keep her". He said, "Can you wait until summer?" Well you know my driveway isn't paved and it is Wyoming after all and that whole wind thing and if you don't like the weather wait 10 minutes and it will change, and it changes in both directions.
He said, "C'mere" and we walked over to the large metal door into the next room and he says, "this was rolled". And my pointed ears perked, like a dog's, and I said, "Rolled?!" Em Dee five fifty?! errr Imron?! Now that's a cool name for a dog. "Here Imron - c'mere boy".
Well suffice to say, I was hooked and I had my plan.
Still, you don't just speak with one or two professionals when you've got a project like Lil' Queeny and my next stop was over to the Auto Body shop. But Bob wasn't there, it was lunch time.
So I called Bob up on the telephone and he said, "Hello, this is Bob speaking", I said, "this here the Bob got the pickup truck for sale?" No wait, that was something else.
But I did talk to Prasma Bob and he listened carefully to me and he talked about the two-part epoxies and additives and artificial sweetners and stuff. And there was lots of good advice and help and information and I was feeling really fortunate to have found my professionals. Soon I mentioned the Imron products to Prasma Bob that Napa Chuck had talked of and he said, "oh yes, I've sprayed lots of that" and the 2.8 primer and the 3.5 top-coats were affirmed as excellent choices and he mentioned the over-spray problems and didn't know a lot about the rolling properties (because he a sprayer), but was not against the concept and even agreeable in my situation and he said, "because you don't know what that non-OEM paint is, you can put some lacquer thinner on it to see if it's affected" and I remembered once already doing that and finding that it lifted some of the bright white and my heart dropped.
And it was at this point that I learned what catalyst means.
(I might be technically wrong here, but) catalyst, hardener, activator - they are all basically the same thing. These are added to oil-based (automotive grade) paints to harden the surface, making it more durable, chemically resistant, less or un-affected by oil-based products placed OVER it. If my lacquer thinner had raised the bright white on Lil' Queeny, that probably means it was non-catalyzed and any oil based product I put over it will probably bubble it, lift it, ruin the new layer. That old stuff had to come off.
Okay, there's sanding (and it looks like Zinc Chromate was used between the original coat and the bright white - you remember that - toxic right?). Then there's aircraft paint-stripper (messy and can you ever REALLY get that stuff out of all the crevices - if not, the seam paint will fail), or wipe-off with the right thinner, but the ease of that depends on the previous paint and its properties. Of course that was the factor for any removal process and to this point I had found the bright white VERY durable, in spite of not being catalyzed - well, except that whole peeling thing where the base was bent over or slammed with staples.
And there was a lot of surface to address!




I slept on it.
The next morning I tried out the thinners to see if it really did lift the old stuff and yup, there was enough of it to be concerned.
I took a piece of sample metal in to talk with Prasma Bob in person and we figured on several remedies, none of which were easy, and I showed him that Finium data sheet that I got from Diamond Vogel. Now this type of product is outside the realm of Bob's expertise, but he said it looked pretty good and might well do the trick. He also directed me over to another fella I call Wyoming Auto Ben, who had recently mixed up a bunch of similar stuff for a big industrial job that had gone belly-up so they didn't buy it and it might still be on sale!
Well here was another professional (Ben) who was so helpful, and listened (they all listen better than my doctor). Ben looked at the Finium data sheet and said, "oh yes, this is good stuff. We've got it on the building here". And he showed me the wall where the contractor had ONLY power washed the galvanized (which is apparently a more difficult surface than aluminum) to get the peeling off, no sanding or feathering, and that it was now two years old.


I had two more professionals to consult; dear daughter and dear son.
DD had worked at Diamond Vogel a number of years ago, at the counter and in the warehouse and had taken the courses. I called her and told her my situation (I didn't mention the non-catalyzed thing, just wanted to know how to paint aluminum) and she thought for a minute and suggested the two-part epoxies route, like Prasma Bob. She didn't recall Finium and thought it might be a new technology and product.
Then I texted DS (who is a painting contractor, currently and recently operating out of California) and he said "I really like the Diamond Vogel "coat all" for a base and encapsulation. I think it's a good suggestion".
Finium uses an "advanced, self-linking acrylic technology to create a revolutionary, direct-to-metal, semi-gloss primer-finish", and shows resin type as "self cross-linking 100% acrylic".
And did I mention it is water based, environmentally friendly, economical and can be tinted to any color?
I haven't yet decided whether to spray-on or roll, but having either option is beneficial, and because you don't thin it, and you don't have to add any sweetners, I could more easily experiment with my current sprayer. And it has a good shelf-life so my second color (Lil' Queeny's color band) can be used later to paint Lil' Willy's trailer!
Sorry Chuck, maybe I'll get Imron in a next life. And thanks to everyone, Napa Chuck, Prasma Bob, Wyoming Auto Ben, and of course DD and DS. By the way, DS says to give a hearty shout out to his friends Cody and the gang at Diamond Vogel! And said, "let's get some Diamond Vogel stores out here in California", he's tired of trying to make do with Benjamin Moore.
Hmmm, can you name a dog Finium? "Here boy!"