Filling screw holes in roof

Personally, I'd use Sun Cure. You must know what kind of fiberglass it is though but probably polyester. Sun Cure is great stuff as I've used it for permanent surfboard repair along with using it on the side of my fiberglass TT. My roof is not fiberglass. The Sun cure is of a thick consistency and would be very easy to fill holes in your roof with leaving a slight bit over the hole for a complete seal. Bonds very well when following the instructions. I would never use epoxy on polyester fiberglass. I keep a tube of Sun Cure in my TT in the event there is something I need to repair on my outside walls.

https://www.amazon.com/Sun-Cure-4-4-Fiberfill-Repair/dp/B000PEYSJK/ref=sr_1_2?ie=UTF8&qid=1502126195&sr=8-2&keywords=sun+cure

Thanks, landy :) I never would have thought about JB weld.

You can now buy stranded fiberglass mixed resin in a can with accompanying hardener. Patching with any epoxy or styrene resin will require a learning curve. Paint will need to be removed.

An easier solution may be to buy one of the dual-syringe epoxy kits, tape the holes from underneath, and fill from above.

For sealing fasteners, a butyl based sealant is a good choice.

The commonly available 5 minute or 1 hour epoxies are not really waterproof.

I'd say for just a few screw holes use JB weld. Epoxy must be painted over, it is not UV resistant.

Sometimes paint does not like to stick to epoxy, sand it and wipe it to remove any blush or shiny spots.

I use a lot of 2 part epoxy, of the type for laminating surfboards. To thicken this epoxy I use wood flour, which is basically sanding dust I collect in my belt sander from a 120 grit belt.

It turns the epoxy into various shades of brown depending on the wood the dust was colected from. One needs a lot more dust thean they would expect to use until the epoxy is about a peanut butter consistency. There are dozens of thixotropic agents one can add to epoxy to thicken it up, but wood flour/dust is free and more than effective enough for this task.

One other possibility is mixing the epoxy, then waiting on it to start thickening, and then once gooey and thicker, mush it into the holes with a straight edge, but this can get messy with stringy epoxy leaving hairs from cup and straight edge. One also needs to saturate the fibers with unthickened epoxy first.

If there is paint in the screw holes, I'd want that paint out of there first

Thanks Chris, that does sound more waterproof than filling. Lot of work, tho! There is gelcoat under the paint. Do I need to sand that off, too?

If it is fiberglass I would go to the auto parts store and get some fiberglass fabric and the resin and hardener and use that to patch, cut small squares of the fabric just larger than the holes, sand off the paint in the repair area, re-glass is then sand and prime to seal it.

Bumpyroad wrote:
do we have to check back in prior posts to relearn what the top is made of?
amateur epoxying looks like, well amateur epoxying.
bumpy

Fiberglass

do we have to check back in prior posts to relearn what the top is made of?
amateur epoxying looks like, well amateur epoxying.
bumpy