I still use fiberglass & I've been using a "short hair" fiberglass-type "bondo". Poorboy is right, fiberglass mat/resin just slapped on top of rusty metal isn't good. Personally, I have been welding in as many metal patches as possible, but I still need to short hair fiberglass & bondo the seams of the patches to get everything smooth.

Last edited by PurpleBeeper; 09/26/18 11:14 PM.
70 Roadrunner convt. street car 440+6, NOS, 4-spd, SS springs '96 Mustang GT convt. street car '04 4.6 SOHC, NOS, auto, lowered "Officer, that button is for short on-ramps"