There are steel helmets with fiberglass liners, and Kevlar ones. Steel helmets are made from sheet steel, fiberglass cloth and polyester resin. Kevlar helmets are made from Kevlar cloth and epoxy resin.
Fiberglass resins are typically made by mixing a liquid polymer (such as polyester or epoxy) with a hardening agent or catalyst. The mixture is then applied to fiberglass fabric or matting to create a strong and durable composite material. The resin cures and hardens when exposed to heat or a chemical reaction.
If it is plastic (many speedboats are metal) it will be the plastic Epoxy Resin (exactly the same as the glue) with fiberglass cloth to reinforce it. Epoxy Resin is very strong but somewhat brittle (like concrete), the fiberglass prevent cracks in the Epoxy Resin from growing and reinforces it (like the steel rebar in reinforced concrete does).
Polyester resin, fiberglass, polyurethane, horse hair and cotton
It is generally not recommended to put fiberglass over aluminum, however, people do it. An epoxy polymer resin is usually suggested, and the fiberglass should be very clean.
cant be good for you, so why do it.
Fibre-shelkote distributes vinyl ester resin which is required for underwater usage. Polyester resin is chemically similar to 2 part epoxy, and is much less expensive, but should never be used underwater.
Epoxy resin can be used as a jointing compound.
Mostly polyester resin, but some epoxy as well. Small dinghies can be made of thermoset plastics.
The main material is polyester resin, which is set by a catalyst hardener, so it's basically an epoxy.
Polyester resin is a thermosetting resin, generally a copolymer
The chemical formula for epoxy resin is C15H16O2.