Some of you may remember that a while back I posted about a plumbing problem in a shower enclosure. Couldn't find the leak and neither could the plumber. Simple reason - it wasn't in the pipes!
Now I knew absolutely nothing about tile setting. But I accidentally ran across a reference to sealing the grout. I knew the shower had been re- grouted just before we bought the house. But I didn't know if it had been sealed. So I ran a garden hose in through a window and sprayed it on the walls. Eureka - it leaked!
Went to Home Depot and bought some spray cans of sealer, covered everything I didn't want to seal, and liberally sprayed the walls. The shower no longer leaks and I now know a little bit more about tile than I did.
All problems are obvious *after* the solution is found :-).