The mother-in-law has brown ("mahogany") uPVC windows and front door installed about 22 years ago by C R Smith. On the sunny side of the house the surface "varnish" is peeling away and we would like to re-finish. Ronseal and Dulux sell UPVC paint in white but it seems too risky to try to convert from brown to white. Any suggestions for a suitable varnish or lacquer to restore the look?
Geoff