How to permanently Plug Holes in Polycarbonate Roof

[Tim Brennan]

Many years ago I picked up a used 4'x15' sheet of polycarbonate that was once a conservatory roof. It had holes (where it had previously been screwed down) in it so I filled them in with silicone sealant and made it into a shed roof.

A while later, it started leaking so instead I covered with clear tape made by Gorilla Glue. This lasted a few more years but then the leaks started again.

Is there a method that would work for at least 10 years? I thought of cutting a tennis ball in half and making a dome over the hole and then sticking down with silicone, but again it's the silicone that might fail before 10 years.

Any tips or ideas would be appreciated.

 

[luvmytoolz]

Polycarb's pretty soft, so assuming the screwholes weren't overly big, a nut, bolt and washers either side (with some sort of thread sealant ideally) done tight enough should compress enough to form a dead tight seal that will never leak.

 

[Tim Brennan]

Excellent. I think that might just work. I have some thread locker too so can do that today.