Originally Posted by Patricia D.
Thanks for the information. I was under the impression that there are special products for the roof, not just primer and paint. I have to paint the whole trailer and if I start with the roof, it will give me a chance to get a feel for marine paint before I do the rest.
You don't need special products for the roof when you have a fiberglass roof. Quit looking at those products, they are the wrong thing to do with your roof. All that aggressive marketing of super duper roof fix products and people in forums that don't know what is what is getting you confused on what to do. Those products are for thin metal roofs that get pin holes that penetrate all the way through the metal due to metal corrosion
As to the holes you are seeing.... Do they actually penetrate all the way through the shell or are you just seeing dots of light
where the gel coat has been lost? Anywhere the gel coat is lost you will see light
coming through the shell but that does not mean there is a leak happening. I strongly suspect that what you are seeing is not a bunch of actual holes that penetrate through the shell but instead they are areas where the gel coat is missing. A pin hole of light
showing through on the inside is not a huge issue as it is not causing a leak, gel coat touch up or primer and paint on the pin dot and that problem is fixed. But a field of stars of lots of pin holes over a lot of the roof areas is an indication your gel coat on the roof area has gotten too thin and it is time to add more gel coat or paint to protect the fiberglass resin from UV damage. Since you were removing that tar like coating it is very likely some of the get coat went with it.
If those were just dots of light from missing gel coat adding that resin on the inside of the shell did not do anything to fix this issue since there never was a hole going all the way through. So for anyone else reading this thread realize you do need to figure out if the issue is a through hole or loss of gel coat.
An actual hole in the shell that penetrates all the way through does create water damage issues but small holes can be easily filled with thick epoxy (put tape against the opposite side of shell as a backer) then sand the outside surface of the tiny spot smooth before priming and painting
. Otherwise if you did not want to paint you could get a gel coat touch up kit and use that instead of paint.