I like the idea of the Eastwood's Black Heavy Duty Anti Rust as it is Black in color and if you use it inside the quarters it will look like black undercoating where as the 3M Rust fFighter dries to a amber  like color.Inside doors and rockers is fine to use the 3M Rust fighter as you don't see it,but when you open the trunk you can see the back of the quarters and that is where I would use the Eastwood product

Edited by 72 GTS 429 - 08-April-2012 at 6:11AM

the 3M stays soft and that is why I wouldn't use it in the trunk.

Edited by 72 GTS 429 - 08-April-2012 at 6:12AM

yes but like I said only put it in the crevice and try not to get it all over the quarter and same thing around the wheel well as the  Cavity Wax products don't harden so you only want to spray it in the crevice to keep out moisture and water from seeping down in between the tight crevice of the 2 metals

I just used the Eastwood Anti Rust to spray the cowl area around under the wiper transmission area. I like it because I coul go through the cowl openings on the side and turn the applicator to spray 360 degrees. I used it in the lower quarters and inside the frame rails on my GTO.  Left a rubbery waxy coating.  There are two tpyes, mine was not the black, but it looks black.

Randy

yah in the catalog Eastwood sells an amber colored Anti rust but don't see it on the website