Q: We have a 1993 Newmar Kountry Star diesel-pusher motorhome. The graywater tank has a few very fine cracks on an inside corner. It’s almost impossible to weld without pulling the tank out of the motorhome. I have used automotive bumper glue, windshield glue and many other epoxy type glues brought to me by my buddies. Of all of these I have tried maybe 10 to 12 different types of epoxies, none of which, worked. You are my last hope. With all of the glues applied I could stick a screwdriver between the glue and the tank and peel it off easily.
A: Unfortunately these tanks are difficult to get anything to stick to, as you learned. VersaChem (formerly Syon) makes a kit for this type of repair. If you can’t find it at your local RV store, here’s a URL for a kit: www.pplmotorhomes.com/parts/caulks-sealants/holding-tank-repair-kit.htm, or call 800-755-4775.