I fell for them too...
I have bought a few things at swap meets that didn't live up to the claims made for them too..dont feel bad!..its easy to get suckered in at those places..I go to,and sold stuff at a lot of them in the past..you do get some awesome deals at them too..just have to know what your looking for,how much its worth,and what defects to look for in parts you want.
One was a guy using this "miracle" aluminum repair welding rod..he punched holes in coke cans,and filled them right in with only a propane torch!--then he does an A/C codenser,a heater core,broken carb bases,even punched holes in an aluminum canoe,and the stuff worked tits--his wife or girlfriend even did the same demonstration---I figured if even she could do it,I could-..until I bought some,and took it home and tried it!
I don't know what their secret was,but it sure worked slick when they demonstrated it!--I could only succeed in filling in holes in beer cans,anything else I tried to "weld" with it was a dismal failure!--only once did I succeed in repaing a cracked block on a briggs and stratton mower engine with it..every other time,it would roll off and fall on the floor.It just wont do "vertical" welds.I think maybe the "stainless steel brush" he used was the secret..I only had plain steel brushes!--
I even bought some "Rub-On" aluminum welding rod at the welding supply place I get my tanks filled at,its the same stuff!--I got 5 lbs for 11 bucks,it was 12 bucks at the swap meet for about 10 sticks of it!

--didn't work any better though--it must take some practice or special technique to use it..I have seen "infomercials" on late night tv selling similar stuff,and also in the Northern Tool catolog..I wont be buying any more!--I'll save my money to have someone tig or mig weld it instead..I was hoping I could fix broken "ears" on die cast zinc carbs like they did..never succeeded..
Another time I bought theese "miracle" drill bits at a local flea market held every sunday--I saw the guy there several weeks,I figured if he was a crook,he'd be evicted by then--..the guy drilled thru a file,a cinder block,leaf springs,even hardened steel plate,like butter!--so I figured I'd try a set...35 bucks "today only"...
So I get them home,stick one in the drill press,and try it on a peice of diamond plate..it went right thru,just like it did for him--the first few holes anyway!..after 5 holes,it was dull as a hoe!..
Then I read on the label on the box "NOTE: NOT FOR MILD STEEL!!--USE ON HARDENED STEEL OR MASONARY ONLY!" then in teeny letter "warranty void if used on mild steel or non ferrous metals"...I was going to cram them up the guys A$$ the following sunday..but of course I never saw him again..
