Canvas Snap question

[Steve S]

I need to add a canvas snap or two due to a canvas modification that was made. Does anyone know what size drill I should to predrill prior to inserting the snap/screw onto the hull?

 

[rcknecht]

When I did it I got a drill bit the size of the inner shaft of the screw. I used painters tape on the fiberglass where I was drilling the holes. I also used 4400 on the threads of the screw. The snap screws have a couple of sizes and lengths. I don't remember bit size I used.

 

[b_arrington]

Depends on the screw. Best bet it to match the drill bit to the body of the screw; use a bit just slightly smaller than the threads. Chamfer or countersink the gelcoat or it WILL crack.

 

[boatrboy]

When in doubt - drill a small piece of wood as a test

 

[gerryb]

I also like to slightly taper or countersink the hole as I think it does help with spider cracks around the outside of the hole. 4200 by 3M is fine if you want some more tensile holding power.

 

[Jeepers]

9/64