I think I have found the problem with my fins getting wavy on my skin mounts. I was using Derma Grip Fin & Fish Coat Clear and Silkspan that I had ordered from McKenzie. I tried sealing them with lacquer also but they still dried wavy. I just finished the fins on another mount but this time, as I decided to do the fins natural, I did not use the Silkspan. The Derma Grip Fin and Fish Coat did wonderful! I ordered the Silkspan from McKenzie and have had nothing but trouble every time I use it. Like I said earlier I have been out of the fish mounting game for a few years since I lost my shop to a fire. Used to do great fins back then with Derma Grip and Silkspan but I noticed when my new order came in the Silkspan felt different right away. Thinking about ordering my next Silkspan from WASCO or someone else. Does anyone have any suggestions on who has the best or any other material I should try?