On Monday, June 11, 2012 11:04:09 AM UTC-4, Davej wrote:
After six months the thing is leaking like a sieve. It has apparently
lost the waterproof coating.

ALL blue tarps are garbage, and have been since the early 1980's at least. Where have you been?

They're meant for TEMPORARY, OCCASIONAL use. If you want a better tarp go with the silver or green ones. Even those aren't meant for permanent installations. No tarp is. Brown canvas tarps last the longest but even those aren't forever.