<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Fresno Dude:
A gray or black water tank that is cracked can be repaired by buffing area with sandpaper, using a layer of sealant like silicone on the area, then some synthetic cloth, another layer of sealant, more cloth, about three layers thick. I have had a repair hold for ten years with this technique. It also works for roof repair, especially where a fiberglass nose matches with the rest of the roof. For a roof, I use roofing sealant, but make sure to work it into the fabric. </div></BLOCKQUOTE>
Or you can get a roll of Eternabond repair tape and after cleaning off the effected area apply the strip of patching tape.
2001 Winnebago Adventurer WFG35U