How to repair old rubber carburetor boots!

We have tried lots of different methods to fix / repair old carb boots on our dirt bikes and other equipment but have never had much success. We did find that soaking them in Aerospace 303 made them much more flexible, but it didn’t help with the cracks. We have also tried vulcanizing the rubber, but once again that doesn’t repair the cracks.

So what has worked for us is applying silicone rubber gasket seal, that is compatible with fuel, and mixing in strands of drywall fiber glass tape. I assume that stranded fiberglass would work as well. Let it dry for a few days and you are ready to go. We have actually had boots almost torn in half that are now back on bikes and have been running strong for years. Just make sure you start with a clean, grease free boot.