Starting on bondo, I need some help!

[jonnyboy1617]

First of all, thanks for the help with the fender question I had, it felt to late to say it there and re-open the thread.

Okay, so I am now putting bondo on the duster

I was wondering how do I get the panel back even again since I have only sanded the primer to metal in select areas. Do I go back and spray only the places where metal shows? Then block sand again? Or do I just spray the entire car with the final primer once Im ready, and block sand it even? I hope im making sense.

And also, I still see black "rings" around the bondo where the primer did not sand off. Does this mean I need more bondo around the outside of the area? Thanks.

 

[homecloned]

The rings are low spots, you are sanding off to much plastic. How long is your sanding block? It should be at least 12" on long panels.

 

[jonnyboy1617]

And I better say this before I get hounded by body pro's. If you notice that I was only sanding in one direction, I just now read that I should sand in an "x" pattern. It makes sense, so I'll starts doing it.

Edit: And the sanding block is over 16".

 

[homecloned]

Ok the block is good. Do one side of the body line at a time ie. top or bottom and keep a yard stick/straight edge handy to check your work. Check often while sanding so you dont sand to far down in those areas. Hope this helps. Noel

 

[70Duster440]

Knowing when to switch grits is important too. Go to too fine a grit too soon and you'll just polish the spot instead of getting it flat.