Re: silver solder?
At work we use the 2part epoxy sealer from Caswell and it works very well on the over 20 tanks we have done over the past 4 years. Can't say the same about a few tanks that had been done with some gray sludge. The Caswell sealer is clear.
Live life as its your last day... it just may be
Learn to do it right or how to fix it later, quicker to do it right the first time.