I have already searched the forums about caulking but I am still confused about which to use where.The "Caulking" around my sky light is very thick but it has a crack in the middle almost all the way around. We are having heavy rains right now and I noticed a small amount of water dripping around one area of the skylight. I got up on the roof and found the crack. I guess when it gets sunny again I will have to replace the caulking on and around everything up there. I just have a tarp up there now.From reading here it seems silicone is not recommended. What is up there is very wide and very thick. I used Dicor when we put our solar wires through the roof and I have used Eternabond on an older 5th wheel to repair the roof.Need your expertise!Thanks

first off, NO to silicone.what you are talking about is what i refer to as putty, it is put around everything up on top.what i would do is simply take it off, carefully!, and redo it with a self leveling caulking, any quality caulking will do, when you go to the 'rv' store ask the what they would recommend.make sure you don't damage the roofing material. if you want to get realllllly facny you can finish it off with the dicor 4 inch tape... that will d it.

I recommend neither of those for skylight leaks, nor do I think you have to remove any caulk.I battled that for years until I found Heng's RV roof coating. Goes on like paint and seals up anything that leaks. Might take a few coats.

littlemo wrote:I just have a tarp up there now.Good idea. Make sure the tarp is covering only the skylight area so you're sure that's where the leak starts.

http://www.surebond.com/SB-140/Doesn't react with plastic that skylights are made of. Tube of it came with my new skylight. Skylights way over priced IMO. 14" X 22" $124.00 You can probably find lots cheaper but I got what I could get in a hurry.

My experience has been, for irregular surfaces I use Dicor, for flat surfaces Eternabond. I have put new Dicor over existing caulk as long as it's surface was clean. Old Dicor can be removed with "plastic" putty knife if you think it is necessary. I have used roof coating and a gallon will cover about 50 Sq. Ft. Once you mix it up, as the one that I used was a two part material, you have only so much time to get work done. Also remainder of gallon will set up and can not be used. Also Dicor is about $9.00 a tube and the roof coating $55.00.

Dicor or Eternabond | Good Sam Community

JIMNLIN
Explorer III
Nov 30, 2015
I do a twice a year check on all roof jacks and fixtures and all lap sealant.
The sealant on my '97 5er's skylite pulled up for about 10" on one side in '05. I pulled all that would come off and added Dicor self leveling to that spot.

I also added a bit of Dicor to a few small hairline cracks in the sealant.

The unit has never leaked other than hail cracking the same skylite 6 years ago. I replaced it with a unbreakable one made of Lexan.
I installed the new one as the factory with butyl tape 1st and then Dicor over the edges and screw heads.

There are other good sealant brand on the market that work just as good as Dicor.
Dave_H_M
Explorer II
Nov 30, 2015
Why complicate the issue. Just do like 2oldman suggests but clean the surface first.

Way I have done it for years
John_Joey
Explorer
Nov 30, 2015
Dave H M wrote:
Why complicate the issue. Just do like 2oldman suggests but clean the surface first.

Way I have done it for years

Because the Dicor is no-longer attached to the roof. It has lifted off the roof. Filling in the cracks now is too late, the damage has been done.
2oldman
Explorer II
Nov 30, 2015
OP needs to be sure there's no water left in the skylight frame inside. On mine, there's a rectangular piece of perimeter trim I had to remove and let the wood framing dry out.
jsmart
Explorer
Dec 01, 2015
X2 dicor self leveling after cleaning.

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