[header] How to sand fiberglass [title] Allow the fiberglass to cure in the sun. [step] If you are working with a new fiberglass component, it will have a thin layer of gelcoat on its surface. Gelcoat is an epoxy or resin-based compound that is used to line the molds when making fiberglass components.
[header] How to sand fiberglass [title] Allow the fiberglass to cure in the sun. [step] If you are working with a new fiberglass component, it will have a thin layer of gelcoat on its surface. Gelcoat is an epoxy or resin-based compound that is used to line the molds when making fiberglass components.
This prevents the color from fading as the new materials are made. If there is not an epoxy layer, you will have to sand this surface using a sanding sponge. When you are treating fiberglass parts of a model, wait for the sealant to cure completely. [substeps] If you are working with fiberglass parts of a model at home, you may expose the fiberglass to bright sunlight for an hour during the process of repair. Before sanding, let the fiberglass sit out in the sun for 2 to 7 days to cure the gelcoat. This process releases any air pockets from the gelcoat that would cause problems when sanding and painting. [substeps] Fiberglass gelcoat can be purchased at any automotive store. Make sure to read the address that comes with the product or the instructions on the packaging.