ProFlex flexible RV sealant

My experiences with Pro-Flex have been that it is hard to work with and attracts dirt like a giant sponge after it is applied. I would suggest that you call your manufacturer and find out what they use and do the same. And, I did clean off the old when I used Pro-Flex.

If you don't have silicone on there now, you can most likely go over it with ProFlex. What I do is use a rag dampened with lacquer thinner to clear the scum off the old caulk first. OTOH, any of the old caulk that comes off easily, you might as well remove.

Why can you not use it for roof sealing?

I use Proflex on all seams of my last 3 rv's. I would scrap the old caulking off first and put new on. I use the liquid for roof seams and the caulking in a tube for side seams. I have not found it to attack any more dirt then any other caulking. On the roof seams I usually apply a coat over the other each spring. I clean the surface first and then apply a coat. I have the luxury of having the MH in a garage so I can work in any weather, but the liquid works best when applied at above 60 degrees.

dalmationlovers wrote:
I use Proflex on all seams of my last 3 rv's. I would scrap the old caulking off first and put new on. I use the liquid for roof seams and the caulking in a tube for side seams. I have not found it to attack any more dirt then any other caulking. On the roof seams I usually apply a coat over the other each spring. I clean the surface first and then apply a coat. I have the luxury of having the MH in a garage so I can work in any weather, but the liquid works best when applied at above 60 degrees.

dalmationlovers:

Are/were all these roof surfaces fiberglass that you used the Proflex on?

LeRoy

I had fiberglass, alumn, and rubber.

jdog wrote:
Why can you not use it for roof sealing?

Personally I have found that over time it will pull away from a TPO roof. However TPO is uncommom; people call it a rubber roof but it's more like polyethylene, which almost nothing sticks to. Most "rubber" roofs are EDPM, and I would guess that ProFlex would stick to EDPM.

All that said, Dicor lap sealant would be my choice for a roof. Its style of bulk buildup seems better suited to roof sealing jobs.

I apply it over the existing caulk. I clean the area with soap and water and have never had an issue with it not sticking. Use some liquid dish washing soap diluted in water and put it on your fingers to smooth out the caulk. Otherwise it sticks to your fingers.

I found some Proflex that was clear. Haven't found it to attract dirt any more than any other sealant.

Proflex is the best sealant to use for vertical surfaces. On the roof Dicor is better. Both can be used with surface prepping with a solvent and they recommend using Naptha which is not sold in my state but I found that the substitute product sold by Home Depot works equally well.

Klean-Strip Industrial Maintenance Coating Thinner