1. NEVER use SILICONE as a sealant...Silicone will not stick to silicone, so it cannot be resealed if leak starts again... PROFLEX RV is better.
2. You can buy a product from Amazon called Capn Tolleys Creaping Crack Cure. It is a little expensive and goes on like milk. If when putting it on you see it suck inside a crack, mark the spot with blue tape. Wait about 30 minutes and crack cure this area again (not the whole area) just the suck area. NOTE: The crack cure is for smaller leaks.
I had a leak on the bottom part of the slide... took it all the way off and cleaned it and put a ton of sealant on it and put it back together.