Home Problems & Solutions Wrinkling appears on a surface painted with varnish paint. Metal • Wood CausesA second coat was applied before the first one fully dried.Α very thick coat was applied.Τhe application was done in high temperature causing the surface to dry. SolutionRemove any loose residues.Sand and clean the surface (if necessary, a Paint Stripper can be used).Apply one coat of anti-rust primer and two coats of HARD DUKO or HARD & GLOSS.