Farmall Cub

Hi all - Back from a week long business trip.

I got to cleaning the paint and rust off the fuel tank and hood. The vast majority of the sheet metal is in great shape. Where the paint has been gone for a while, the sheet metal is pock marked. Not deep, but obvious. Now here's the question.

Do you fill those small dimples with ???? or do you prime and paint?

Ken

I used a Bondo style body filler on the bigger pits and glazing compound on the smaller stuff. Welcome back.

Al the rust must be removed. Spot grind the dimples. If very deep, fill with Bondo and file/sand smooth. Prime with sandable primer. Fill any low spots with glazing and spot putty-- give it plenty of time to dry. Wet sand with 600 grit, but not to sand through the primer. Prime again with sandable primer. Fill any low spots again. Lightly prime again. Then fog on a contrasting sandable primer, gray over red or vice-versa. Sand lightly. Any high spots will cut through the last primer first, indicating the remaining low spots.
Just how far you go with this process is up to you. The more, the better.

You might check with your local automotive paint supplier. I used a product called "Feather-Fill" on my H and the wife's 8N. Its a thick, fast drying primer made for filling scratches and pock marks. John

if you can sandblast the rust that would be the best way to prep for the next step. if you can't sandblast, clean it up the best you can and use something like rust mort. its seals it up so then you can skim coat it with your body filler. then you can prime and paint.

Rob in NH wrote:if you can sandblast the rust that would be the best way to prep for the next step..

This would be ideal. Blasting would remove the rust from the pitted areas and make it ready for body filler. Again, depending on the finish desired, see the previous posts.

After I cleaned mine up, I treated it with OSPHO, then filled everything. My dealings with those rust dimples is if I do not treat with OSPHO or something similar, the rust will pop back out. Last one I did was stored in an old chicken house so you can imagine the rust pitting but after using OSPHO I have not needed to redo anything.