My job in this video was simple (and also kind of gross): scrape off old, failing RV sealant and try to seal it better this time. I’ve got gaps showing up on my rear fiberglass end cap where the sidewall meets—my old sealant lasted a while, but after a couple years it started separating and cracking. I show you exactly how I remove it with cheap plastic scraper tools (super satisfying, by the way), what I found underneath (yep… water definitely got back there), and how I clean and prep the area so the new sealant actually has a chance to stick. I walk through my cleaning process using Simple Green, then rinsing/wiping, and finishing with 90% isopropyl alcohol so there’s no cleaner residue left behind. Then I apply a new adhesive-style sealant I’m testing: Chem Link (they sent me M1 and Duralink 50). I’m not pretending I’m a pro at laying a perfect bead—sealant takes practice—so I also share what I’m still learning (small bead, don’t press too hard when tooling). The big takeaway: staying on top of sealant is one of the best ways to prevent expensive water damage, especially around seams and end caps.