Gas tank - Sealing the son of a gun up and testing it?

[Nimrod]

What kind of tips do you all have for sealing a home made gas tank. I just finished welding up the tank for my chopper project last night with my crappy flux core wire feed machine (there is about 8 feet of welding on the tank). I was planning on using a gas tank sealer I bought from Speedway a while back, but I would like to test the tank first.
Whats the best way....air, water, gas, alcohol?
And any tips on using a gas tank sealer?

[Mr 42]

Low air pressure, and soap water.

[flt-blk]

If it's the pour in and slosh around type of sealer, use it first.
I sealed my new home made tank and found 1 weld pin hole.
The sealer weeped through the hole and sealed it tight.
Good Luck
TZ

[noboD]

If you are going to use air, fill it mostly with water, or the soapy water trick. If you fill it with all air and it blows it will be like a gernade.

[thirtytwo]

i would use something that had the same consistancy as gas ,ive seen a couple of differnt gas tank sealents people used and not work(sorry i dont know product names) there is some in my coupe and i keep pulling flakes out of it looks like someone stuffed a news paper in there, be leary..

[manyolcars]

POR 15s tank sealer is the best I have ever seen and I have sealed a LOT of tanks in the last 30 years