Epoxy and polyester resin are the two basic types utilized in fiberglass projects. The most popular kind of resin is polyester resin. It is less costly and easier to work with than epoxy. It isn't as robust or water-resistant as epoxy, though. It is available in several grades, such as finishing resin, ortho laminating resin, and ISO resin. Ortho laminating and ISO resin will harden sticky, allowing for several layers to be applied without the need for sanding in between. For a finish that is free of tack, use a finishing resin or add wax to your last coat. Because of its strength and longevity, epoxy resin is more expensive than polyester resin. Fast, medium, and slow are the three different hardener speeds that are included. With a firm, tack-free surface, epoxy will cure.

The scent of polyester resins is really overpowering. It is essential to have a well-ventilated space where you can operate. A quality respirator is also crucial. If you are unable to complete your craft outside, place it wherever air can flow, ideally with a window or door open. The smell of epoxy resin is not as strong as that of polyester and vinyl ester resins, but it is still present.

When working with resin, you must move quickly. While you shouldn't mix or measure too quickly, you should move quickly enough to prevent the resin from beginning to gel in your mixing cup. To ensure that nothing hinders the resin process, have everything prepared.