Originally Posted by Derek Johnson
Butyl tape is the soft, grey, putty-like tape that comes in a roll. It is used between the fiberglass
and the window frames and vent frames. It squishes out, then you trim it and then add another sealant. On top the factory used Plast-T-Cote as mentioned in the other post. It is a fibered roof coating that you put on with a disposable brush. Every few years I scrub the old coating, tape it off so it looks halfway decent (it can make a mess), and then add a fresh coat right over the old coating. The old coating sometimes has small cracks, but it has never peeled up and I have never had to scrape or remove any of it. It dries fairly hard and you cannot seal a crack by just pushing it together, so I don't know what is on your trailer that allowed you to do this.
We've had our trailer for 11 years and this has worked fine for me so far.
Is that Plast-T-Cote that hard as a rock crap that is all around much of the stuff on the roof? and all over the roof where it should not be?
I've been wondering what that stuff was and why anyone would ever use anything like that on an RV. And I've been trying to figure out how to remove it without damaging the gel coat. Its awful. Looks terrible and doesn't seal anything that I can see.
A vent should be put down with a single layer of Butyl tape, then the screws tightened and you walk away from it. Later, snug the screws again, and then using plastic scrapers, etc, remove what has oozed out. Then mask off (if you care about your work) and apply Dicor self leveling sealant. I like GeoCel Pro Flex, but the stuff seems to attract dirt and where I used white around a couple of places, its now dirty looking and won't clean up. I did use black Pro Cel around the new Black outside lights
I installed to replace the old yellowed ones at the dump station, porch and front of the trailer.