These lacquers are often used as water repelling protection on unfinished leathers as suede, nubuk, etc., but the known low mechanic resistance of the polymer does not give effective results. The perfect adhesion of finishing, the most important thing, may be obtained using very fine resins and adequate penetrating agents. The problem is that penetrators very often reduce water repellency, and resins with very fine particles are still insufficient. A second field of research for an adequate finishing of water-proofed leathers is the use of products which in no way compromise water repellency. Any auxiliary based on surfactants or hydrophilic chemical products must obviously be avoided.
Wax emulsions are the best solution.
They have been studied to be emulsified with special techniques to avoid any possible trouble. DC 221 requires no particular precaution because easily oversprayed. DC 316 should be more carefully used, but it is very effective. Proteic substances, such as modified caseins, shellac, albumin, are to be avoided because highly hydrophilic. If a filling, matting and releasing agent is needed together with the wax dispersion, DC 326 is our suggestion, a dispersion of oils, waxes and amorphous substances.