Flakey-brakey gas tanks

["Arnie Sugar" <asugar@hwageo.com>]

I just pulled out my gas tanks, and called a few radiator shops about
cleaning & coating them.  The cleaning methods range from acid, to
caustic, to sandblasting.  I think this was covered before, but any
ideas on which is best, and what type of coating is best? Any specific
leads in the Seattle/north area?  Thanks in advance. 
Also, anyone want to buy a used gas filter? cheap!
Arnie