Underside of the car...undercoat or no undercoat???

[Lord Warlock]

I think I'll probably test out talstrip on the inner left fender area under the battery box, I had fiberglassed a small section there and i need to decide if it needs to come off and get replaced by metal or what simply covered again with more undercoat.  Its a good place to see how it works.  May as well learn to get comfy in the fenders anyway, i'll have to replace the brakes/spindles/rotors eventually. 

[mridolfo]

I use a heat gun and scraper to get the under coating off.  I don't like the fumes that you get when you use a torch.

[Arigmaster]

I used a heat gun and a scraper on mine to get the old undercoat off... I D/A sander\d any surface rust I found (not very much) and treated it. I followed with epoxy primer & POR-15. Then sprayed on Rhino Bedliner instead of undercoat. I did hit the wheel openings with some rattle can undercoat afterward for a more factory look.

[Charger-Bodie]

sandblast it and have it nice and clean real fast !!

[dongar69]

THAT SEM UNDERCOATING , DOES IT COME IN A GALLON AND USE A SHUZT GUN OR IS IT IN A CAN ?

I borrowed this image from an Eastwood catalog: