Ordinary wood stains available on the market, especially when used on softwood, must always be treated with wood-protecting impregnation or protection against fungi that discolor the wood.. If this is not done, the wood will tend to discolour to a non-repairable black/blue below the transparent stain. A primer ensures good adhesion with the subsequent wood stain because there is nothing worse than widespread flaking of the stain over time. The only remedy for this is time-consuming sanding. Remmers 3in1 glazes are compositions of a wood treatment, impregnation and protection stain all in one product. They give the wood a natural matt and breathable finish to protect the wood against moisture, UV radiation, pest infestation, nesting wasps, mould & algae. And the best thing: After a long standing time, during which the coating weathers evenly, the wood can usually be repainted without prior sanding to look as good as new - 3in1 stain by Remmers save time and money!