How to Make a Fiberglass Subwoofer Box

Step 2 2. Tape Layer

Using a good quality masking tape, the blue painters tape works best, start creating a layer of tape in the area that you will be glassing. I recommend that you do 2 layers, and crisscross them to ensure you don't get resin seeping through. Resin will not come off of metal, clothes, carpet, or your dog, so be careful. Extend the tape layer a few (3-4) inches past where your box will go, and also glass out a few inches past that (but within the tapes area).