All you have to do is: Clean the surface well. Acetone works as a good final wipe Cut the top and puncture the inner seal Apply the caulking over clean, well adhered old caulking (no silicone) Final Coverage - 25 linear feet per 10 oz tube It's a great idea to always keep a tube of RV Flex Repair Self Leveling Caulking Lap Sealant on hand for when issues come up. You don't want to get caught without it when you really need it. It's also a great gift for your fellow campers. Ziollo RV Flex Repair Self Leveling Caulking Your caulking is split and peelingYour vents are showing signs of wearYour skylights are ready to leak These problems are way too common and often you wonder how am I going to deal with this? RV Flex Repair Self Leveling Caulking Lap Sealant is specially formulated to be applied over clean, old caulking. This allows you to quickly make repairs or prep for your full roof restoration. It sticks to virtually all surfaces except silicone. The Self Leveling Caulking is White and compatible with itself and with: RV Flex Repair Roof TapeRV Flex Repair 100% Silicone Roof Coating Easy To Use Clean the surface before applyingCut the tip and puncture the internal sealApply RV Flex Repair Caulking Covers 25 Linear Feet 25 linear feet of coverage per 10 oz tubeCan be applied in dry or wet conditionsCan paint over after 24 hoursNon Hazardous and solvent-free Self Leveling Ziollo RV Flex Repair Caulking is self-leveling, will not shrink, and stays flexible. Multi-Purpose Works on many different surfaces. EPDM, Metal, Aluminum, PVC, Kynar, Wood, Concrete, and Fiberglass. Easy To Use Covers 25 Linear Feet Self Leveling Multi-Purpose Ziollo RV Flex Repair Caulking Lap Sealant (4-10 oz Tubes of RV Caulk) Ziollo RV Flex Repair Caulking Sealant Kit (1 Tape, 4 Tubes, and 1G Can) Add to Cart Add to Cart Customer Reviews 4.6 out of 5 stars 1,378 4.6 out of 5 stars 1,378 Price $49.95$49.95 $239.95$239.95 Kit Includes 4-10 oz Caulking Tubes 1 Flex Tape, 4 Caulking Tubes, and 1 Gallon Silicone RV Roof Sealant