I recently installed an new shower with acrylic base and have been having terrible problems getting the caulk to seal at the base. It just does not want to stick to the acrylic and water seeps underneath it. The first application was made immediately after removing the plastic protective film so I assumed it was spotlessly clean. After a few days water was seeping under the glass and from the corner where the aluminum supporting rails meet the glass. I removed the silicone and throughly cleaned with isopropyl alcohol and re-caulked. Again after a few days it had detached again. I have been using GE silicone II and it has absolutely no problems sticking to the tiles, glass or aluminum rails but just doesn't want to stick to the acrylic base . Any ideas why or suggestions for a better product that will stick properly to the acrylic base.