slownrusty Posted December 27, 2007 Share Posted December 27, 2007 Gang - I have to drill the fiberglass on my new front spoiler for the mounting points. Typically regular drill bits tear and damage the fiberglass, so what are the proper drill bits to use on Fiberglass? Thanks in advance. Regards - Yasin Quote Link to comment Share on other sites More sharing options...
blueovalz Posted December 27, 2007 Share Posted December 27, 2007 Have you tried tapping over the area with a good masking tape prior to drilling. I've found this helps keep the gel-coat from chipping it. Other than that, I've not had issues with normal twist drill bits. Quote Link to comment Share on other sites More sharing options...
Armand Posted December 28, 2007 Share Posted December 28, 2007 ^^^ditto. Quote Link to comment Share on other sites More sharing options...
Titus_RacerX Posted December 28, 2007 Share Posted December 28, 2007 Sharp drill, high speed, easy pressure. Let the bit do the work. Quote Link to comment Share on other sites More sharing options...
slownrusty Posted December 28, 2007 Author Share Posted December 28, 2007 Terry & Gang - Many thanks for the tips and replies! Regards - Yasin Quote Link to comment Share on other sites More sharing options...
Dragonfly Posted December 28, 2007 Share Posted December 28, 2007 When I bought my CF hood and hatch from John C. he told me I should use a UNIBIT type drill bit for drilling the holes. It worked great and I was very happy with the outcome, I would think this would work just as well on fiberglass. Dragonfly Quote Link to comment Share on other sites More sharing options...
johnc Posted December 28, 2007 Share Posted December 28, 2007 Unibit and the tape mentioned above. Quote Link to comment Share on other sites More sharing options...
slownrusty Posted December 28, 2007 Author Share Posted December 28, 2007 John - When you say "Unibit" do you mean?: Yasin Quote Link to comment Share on other sites More sharing options...
johnc Posted December 28, 2007 Share Posted December 28, 2007 That's it. Quote Link to comment Share on other sites More sharing options...
Dragonfly Posted December 28, 2007 Share Posted December 28, 2007 John - When you say "Unibit" do you mean?: Yasin Yeah thats the type that John suggested I use, and that is what I had in mind with my post above. Dragonfly Quote Link to comment Share on other sites More sharing options...
stagefumer11 Posted December 29, 2007 Share Posted December 29, 2007 I saw something on tv... Use a old blunt drill bit Quote Link to comment Share on other sites More sharing options...
slownrusty Posted January 21, 2008 Author Share Posted January 21, 2008 Well I love that Unibit! I used it quite a bit last night mounting my new front spoiler and it worked perfectly, it does not chip or gouge the fiberglass or gel coat like a regularo bit. Thanks for the heads JohnC! Regards - Yasin Quote Link to comment Share on other sites More sharing options...
Six_Shooter Posted January 21, 2008 Share Posted January 21, 2008 When I need an exact size I will use masking tape and a good sharp HSS drill bit. I sometimes drill a smaller hole and then file it to the size needed. If I just need a close to proper size hole (for mounting or where a washer will be used), I'll use a unibit or similar hole making device. I find that the ones I biuy from Princess Auto under the Power Fist name work better than the Unibit name brand bit. Two flutes in the Power Fist version, and seems to stay sharp longer and cut better because of the two flutes. Quote Link to comment Share on other sites More sharing options...
NCchris Posted January 23, 2008 Share Posted January 23, 2008 Unibit and tape is very good info. Another process for thin fiberglass that tends to twist and tear even with a sharp bit; drill your hole way undersize and open it up to your scribed lines on the tape with your dremil or die grinder and carbide burr. Chris Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.