My tank is leaking again.  this time through the screw holes that hold teh petcock on.  there's no rust and the bolts fasten properly, but gas seems to be seeping through the threads and out the tank.  Is regular Locktite imprevious to gas or is there something else that will seal the threads? 

You acid etched the tank Its very very rare but has happened before ... if there was good bit of rust in the threads ... it will get eaten up into a larger size ...
You cant use loctite or kreem itself, cos it you take it off it will get disturbed and leak again. Probably use the liquid gasket thing, you can re apply each time you remove it. Of course its best that its dry when you do and you can let it cure up even a little. but I put it on float bowl gaskets and it works great against gas. It sorta stays liquid and t wont mix with gas after a light cure.
Cool.
Srinath.

liquid gasket?  the threads and bolts were rust free when i got the tank, so i don't think that's the problem. 

i'll go to autozone today and look for a liquid gasket.  (is it like an RTV sealer?)

i just ordered a new o-ring seal for the petcock and new hoses too just to be sure.

(in my opinion, this gas tank is designed HORRIBLY.  shame on Suzuki.)

OK forget what I said then ... you know its the threads or is it a ripple in the part between the bolt holes ... AKA manufacturing defect due to poor design of the blooming tank ...
Put a swatch of inner tube between the tank and petcock and bolt it in.
Cool.
Srinath.

i picked up some automotive GOOP.  supposed to harden somewhat and still be pliable.  acts as a gasket and sealer.  cures fully in 24 hours.  impervious to gas and oil.

this, combined with new hoses, clamps, and o-ring should seal up the tank well enough.

Yeah, an extra gasket or piece of rubber should do it if it's a faulty gaskett or rough surface. If it's definatly the screw, RTV may work, but I've always had good results with teflon tape on leaking fasteners. just one or two wraps should do it.
Good luck 

good luck with this