Epoxy primer
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Epoxy primer/sealer is a non-porous finish that is typically recommended as the first basecoat over bare steel. Various epoxy primers can also be applied over [[Fiberglassing|fiberglass]], plastic, or the black iron phosphate coating that remains after "converting" [[rust]]. Care must be taken to observe the epoxy maker's recommendations in preparing the surface over which the epoxy is applied. | Epoxy primer/sealer is a non-porous finish that is typically recommended as the first basecoat over bare steel. Various epoxy primers can also be applied over [[Fiberglassing|fiberglass]], plastic, or the black iron phosphate coating that remains after "converting" [[rust]]. Care must be taken to observe the epoxy maker's recommendations in preparing the surface over which the epoxy is applied. | ||
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Real epoxy primer is a two-part mix, with a hardener that has to be added before spraying. The common epoxy paint you buy at the local hardware store in an aerosol can is not considered a true epoxy. | Real epoxy primer is a two-part mix, with a hardener that has to be added before spraying. The common epoxy paint you buy at the local hardware store in an aerosol can is not considered a true epoxy. | ||
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==Cautions== | ==Cautions== | ||
| − | Epoxy primer manufacturers may have very specific recommendations as to how the surface must be prepared, especially in | + | Epoxy primer manufacturers may have very specific recommendations as to how the surface must be prepared, especially in regard to bare metal. Many topcoat failures can be traced all the way back to improper metal preparation, so it is critical to follow the manufacturer's advice regarding surface prep, and to be fully familiarized with proper procedure regarding any prep chemicals to be used, especially acids of any kind. |
| + | ===Temperature=== | ||
The temperature of the air and of the metal '''must''' be taken into account -- it must be high enough for the epoxy primer to properly cure. If the temperature drops below proper temp before it is fully cured, the paint will be bad as the chemical reaction does not continue when the temp rises again. | The temperature of the air and of the metal '''must''' be taken into account -- it must be high enough for the epoxy primer to properly cure. If the temperature drops below proper temp before it is fully cured, the paint will be bad as the chemical reaction does not continue when the temp rises again. | ||
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| + | ===Acids=== | ||
| + | Some epoxies do not cure properly if put over an acid surface. If you use an acid you must be sure all the acid is neutralized before you paint. The acid will prevent the epoxy from properly curing. | ||
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==Tech sheets of epoxy primers recommended for automotive use== | ==Tech sheets of epoxy primers recommended for automotive use== | ||
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