Which adhesive caulk for solar panel mounts??
My CW has Sikaflex in 221, 505 and 715. Which one is best to mount solar mounts to thin fiberglass roof along with screws?
Forum Discussion
brulaz wrote:
both 4200 and 5200 are referred to as "adhesive sealants" in 3M's brochures. 4200 in particular is described as an "excellent adhesive sealant".
In manufacturer's brochure I wouldn't expect anything less :)
According to my friends who used 5200, it's hard to remove, much harder than 4200.
4200 not only cures soft-ish but also cures very slow. It has low density and flows out on sloped surfaces, don't expect it to behave like a usual caulk.
Their "marine" rating has little to do with adhesion to FG. It just means that it doesn't deteriorate fast in seawater and UV exposure.
