I think , Wayne meant a clear, gloss varnish. It's kind depends on the type of colours that were used for painting. If these were of the oil enamel type it should be the oil gloss coat. If these dopes were the acrylic ones it should be the acylic gloss varnish. General rule, the acrylic lacquer can be applied on the enamel coat but never conversely because it may cause damges to the paint layer. Each colour manufacturer offeres the clear gloss and matt varnishes.