The present invention relates to in situ polymerization of fluoropolymer into porous substrates, to improve resistance to degradation by wetting and staining, and wood, to improve resistance to degradation, staining and warping....http://www.google.com.au/patents/US6916549?utm_source=gb-gplus-sharePatent US6916549 - In situ fluoropolymer polymerization into porous substrates
