Coating over old PVC type membrane

Roofguy Said: Yes, works over EPDM too. We prime just about everything coz its just 6 cents a foot + labor and cheap insurance. Other guys just do an adhesion/pull test.

So, after cleaning.... what primer are you applying to epdm pre gaco..?

Vaa, not sure what you are doing different but that's not our experience at all. Did you use the S-20?

You will find very few places on earth more dusty than Lubbock, Texas. If any. That simply hasn't been an issue because the silicone coating films over very quickly and after that nothing on God's green earth will stick to it, except more silicone.

Ours are very bright white.

That's the same primer we use over TPO.

They have a solvent-based silicone called S-10. I can imagine that would be a lot tackier an d attract dirt.

I use the Conklin products. They have a cleaner that is just great. It takes off the oxidation right off the EPDM and it cleans modified and built up roofs like magic. they also have what they call a "tack coat" to apply before you put down the coatings. it is sticky as heck and adheres to the substrate before you apply the top coats. very good! It is an acrylic system so it is water soluble but it dries fast. I like it especially for metal roofs.

Thanks for the help here. I did talk to Bobby Anderson. This does sound like the product I need. Now all I have to do is sell the repair work. Thanks all!

Vaa, no rain won't wash it off, it is 96% solids and the other 4% is not water. In fact you have to be very careful about humidity and letter any moisture get to it as it is moisture-cured. If rain hits it is cures immediately.

Here is the S-20 silicone going on over TPO. Notice it is nice and bright white and shiny. This TPO roof gets over 300,000 sq. ft. of silicone.

@clvr83 the full story (in pictures) on the EPDM lap/Seam Tape Topic http://forum.rooferscoffeeshop.com/view_thread.asp?threadid=46030&forumid=8&pn= but basically some idiot had painted acrylic paint on the corners and the seams and I couldn't get it off, so although I redid the seams on the flat, I chose the easy option for the corners and seams on the upstands, and yeah a bit to do with cost for the customer, the labour to redo those corners would have been quite high, and I don't think they were causing any leaks anyway, so the Silcoat just a precaution.

-Vaa Fakaosifolau

Thanks for sharing. Quite interesting to see the process from begining to end.