The method i use which works about 999 of the time is to put the drill in reverse drill through the gelcoat then put the drill in forward and drill through the rest of the laminate. 46k subscribers step 1.

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Drilling holes in fiberglass. Make an indentation with an ice pick or other suitably sharp object in the exact location where you want to drill your hole. Plumbing fixtures typically come with a fixture template to transfer the required drilled hole openings to the fiberglass surface. The fiberglass will dull drill bits out fast and generally require pilot holes when drilling holes any bigger than 18 inch. Fiberglass is harder and stronger than wood but can just as easily be drilled into using wood drill bits. Drill a small pilot hole in your fiberglass. Fiberglass is waterproof and corrosion proof and often has a gel coating applied to the surface to make it shine.
Use a slow. How to drill fiberglass. If you simply attempt to drill a hole into the fiberglass you will have extreme difficulty in drilling holes without cracking the gelcoat. Drilling the final hole now. The method i use which works about 999 of the time is to put the drill in reverse drill through the gelcoat then put the drill in forward and drill through the rest of the laminate. Make it smaller than the finished hole you are planning to drill.
In most cases drilling the openings is left to the homeowner or plumber doing the final installation. Step 1 mark where the drill holes are going to go using a tape measure and a pencil. If you simply attempt to drill a hole into the fiberglass you will have extreme difficulty in drilling holes without cracking the gelcoat. Planning the install the first step is to determine where the fitting will be installed and as the adage goes. Fiberglass shower enclosures generally come from the manufacturer with no openings for faucets or showerheads. Drilling the pilot hole well the hard work is done now its time to drill the hole.
The gel coat will chip and splinter if precautions are not taken during the.