Preparation for laminating. Your shaped foam blank, painted or not, requires a thorough cleaning just prior to lamination.
Any extraneous material (you can't always see it) will hinder the resin penetration and weaken the fiberglass adhesion.
As I mentioned before' glassing is done one side at a time (deck or
bottom). To protect the side of the board you are not working on from drippy excess resin, you'll have to do what's called taping-off.
Attach strips of paper about 4" wide around
the perimeter of the board with masking tape, 2" to 3" in from the rail on the side opposite the one you are going to laminate. Follow the contour of the board as closely as possible with the tape because
later this will be your guide for trimming the excess fiberglass.
The next step involves working with fiberglass. If you ve never worked with the
stuff before, let me warn you, it's pretty nasty. Fiberglass is just that, glass fibers. If these fibers get into your skin (which they do if you're not careful) you'll burn and itch and be miserable for hours.
The best precaution is to expose as little of your skin as possible. Wear long pants and a long-sleeved high neck shirt. Handle the fiberglass only as necessary.
Laying out the cloth. Lay a piece of the cloth over the entire length of the board. The piece should be more than large
enough to cover the entire board surface plus wrap around the rails and overlap the tape on all sides. If it isn't, you have three choices: Get a larger piece of cloth, move the tape out closer to the rails, or
settle for a less than satisfactory job.
After you've determined that the cloth is the correct size, smooth out all the
creases and wrinkles until it drapes smoothly off the edges.
Finally, trim it to the contour of the board, leaving just enough to still overlap
the tape. Too much excess cloth could cause drooping problems later.