I'm re-purposing my old trick ski for use by my 10 year old son. I can get the front boot where I need it using the inserts but the RTP needs to be moved 1/2-3/4" forward, and there are no inserts for it. Before I drill new holes, the old ones need to be filled. There are around 100 different types of epoxies out there - could anyone recommend one for this purpose? I'm looking for one that will cure slightly flexible given the application, and of course is at least water resistant if not fully waterproof. Any recommendations appreciated, thanks!