Cracks in fiberglass siding
I have an issue on the side of our 2007 Winnebago Voyage. Virtually everywhere the siding is not painted or not covered by a decal, it is starting to crack. There are small cracks but it is looking ...
Forum Discussion
Gjac wrote:Thanks for the info! My FG hasn't cracked yet but it's a concern to me when sitting in the Arizona sun!
This is called crazing in the composite industry which was quite common years ago on FG boats, chopped fiber polyester parts and even composite molds. It is caused by the gel coat being put on too thick which initially makes the product look good(more shiny) until the sun heats it up. Pure resin expands 40 times that of the fiber glass substrate and has little strength. The FG won't move so the resin cracks. Usually this shows up in the radius areas where the resin can pool up. As others have said there is not much that you can do this. I would try to sand the surface in one area to see if the cracks go all the way down to the FG and try to repaint. A good laminator will put no more than .020 of gel coat on. Is it on both sides of the MH or just one side?
