Regular RV putty tape is a gray material in rolls of 3/4″ or 1″ wide with a crepe-paper backing. It’s inexpensive and sold in every RV store. It works well and has been used in the RV industry for many years.
However, in recent years a better “whiter” putty tape has been available. This tape is much stickier and often has a slick, plastic paper backing. Only a little more expensive, it is far more effective because it has some “butyl-like” content, it doesn’t “ooze” as bad as the gray putty tape and can be found up to 1-1/2″ wide. You should be able to find it at your RV store and also at boating supply stores or in heating/air conditioning places where they use it in duct work.
TIP: When using any kind of this tape/sealer, it will tend to stick to itself and the backing. Most annoying. You can make it a lot easier to handle by putting it in the freezer for 10 or so minutes before using. Yes, it will still stick just fine.
The RV Handbook: Essential How-to Guide for the RV Owner
This new edition of The RV Handbook is for all types of RV enthusiasts – from a first-time buyer or renter to the most seasoned RV traveler. Packed with valuable information, checklists, photos, and charts, the guide tells you how to: buy an RV; avoid the single most common mistake novice RVers make; select a towing vehicle; avoid RV repair scams; benefit from technical trends in RV manufacturing; correct the bad towing habit that plagues even experienced RVers; and prevent explosive propane situations. With hundreds of proven RV tips, tricks, and techniques, this expanded handbook tells how to buy, maintain, and optimize RVs, saving both money and time.