I use Tan Kote for sealing my holsters. The reason is that R J Hedley told me to use it. I figured since he used it and made great holsters, why not me. It does make the holster a little hard, but it does loosen up a little with use. I've carried a back pocket holster for 5 years now (practically every day) and it works great and still has good retention. Here is a picture of a recent one: