Brit Rider wrote:I guess I'm as qualified as most to help on this as I do it most days.
Size of hole will dictate your drilling method.
If it's over 10mm you'll want to go with a 2mm or so pilot hole (drilled any which way), and then move to the required size hole saw. Start the hole saw in reverse until through the gel... Once you've got through that you can flick to forward and finish the cut.
When drilling GRP always let the drill bit do the work... barely any pressure is required.
If the hole is small than 10mm then just go with 2-3 steps of drill size to get you to the final hole dia. Always drill gel in reverse, low pressure, fast drill speed.
Centaur wrote:You could also try putting masking tape over the area first too - it helps to stop the drill bit skidding on the shiny gel coat at the start and also seems to help avoid splintering the gel.
Brit Rider wrote:Masking tape is well worth it.... not just for the drill bit tip but also for marking before you start drilling.
Always remember the golden rule:
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