What problem occurs if uncured alkyd enamel is repainted?

Repainting over uncured alkyd enamel can lead to significant issues due to the solvent and resin characteristics of the uncured paint. When a new layer of paint is applied over uncured material, the solvents in the new paint can interact with the uncured layer, causing it to lift and bubble. This reaction is similar to what happens when paint stripper is applied: the solvent breaks down the chemical structure of the uncured enamel, leading to lifting and peeling. This not only damages the finish but also creates a messy and unprofessional appearance that can be difficult to repair.

The potential for lifting and reaction is a crucial consideration in painting and refinishing, as it emphasizes the importance of ensuring that each coat of paint is fully cured before applying additional layers. Understanding this interaction helps painters to avoid costly mistakes and achieve a better final result.