i need to buy some undercoating/ weld thru primer/ and seam sealer. what are your suggestions. last seam sealer i bought was wurth, and under coating might have been SEM, but i forget now. i want the undercoating to be tough and harden up, i was using some one time and it stayed soft. you could scrape it off with your fingernail. As far as the seam sealer, i guess anything thats paint able. i never bought weld thru primer, i just got my welder hooked up tonight, so i have no idea with brand to get.

thanks in advance,

-Frank

Weld thru primer... go to your local ford dealer and order a bottle of the high temp corrosion preventer, the best stuff Ive ever used. Next in line would be the SEM

Seam sealers, no one sealer does it all. Personally I believe duramix has the best sealers.
The controll flow is great for the drip rails and door skins. Have a great heavy body sealer for the trunk seems

Wruth has a nice undercoating that gets hard, unlike the junk 3m sells or evercoat sells.