is thick fiberglass a bad thing?
long story short, replaced qtrs in my 70 dart. where i welded them in caused warp. i used short strand fiberglass to strengthen the thin keystone qtrs and fill the warped areas. in one spot (3"x4" area) its 3/4" deep counting the mud on top. whats your opinion on this holding up? thanks
also whats a good way to strengthen thin sheet metal?