As mentioned in my last instructable Fire extinguishers are amazing and mostly free. What we will be building today is a home made forge capable of melting stainless and we tried glass but it just went mushy.
Gas tank empty (free)
Gas tank full (have)
Fire extinguishers (free)
Step 1: Empty gas tank Clean Clean Clean
Then put a regulator on hung it upside down and turned it on.
Drill small hole in top BE CAREFULL
Drill another hole in bottom
The tank will be quite full with gunk that smells really bad.
YOU MUST CLEAN BEFORE CUTTING.
To clean it out we then made these holes much bigger then put lots of boiling soapy water washing out threw the gas tank.