... - to- use filler and board jointing compound for most building surfaces, includingsand/ cement render and gypsum board. It gives ... even surface for painting. Handycoat Interioris specially manufactured for the painter to repair and touch up surfaces, both old and new, ... surfaces. Ideal as a gypsum board jointing compound and skimcoat, for patching hairline cracks in walls, ceilings, repairing damage ...