I have a old 19' aluminum boat made of 6061 alloy. This is a heat treatable alloy unlike 5052 or 5061. I want to push out dents the best way possible. One thing that confuses me is that i have read that applying heat to the aluminum will ruin the strength of the metal. --- but if it's heat treatable whats the problem? why can't i soften it to 400 degrees max and gently manipulate the metal? doesn't the heat relieve stress from the dent and be benificial to the repair? thanks bill11