Universal Stain Concentrate / Interiors and Exteriors A Special water based liquid stain of high strength and light resistance used to colour directly raw wood as well to Tint Basecoats or Topcoats of the NATURAQUA RANGE. Due to its particular formula the stain can be used for Interior as Exterior projects, keeping a good colour brightness till a max suggested dilution ratio 1-1. Ready for use can be diluted with water, alcohol, acetone and other polar solvents, once dry allows to be overcoated with any type of lacquer waterborne, thinner based or PU.