repaint over old paint

[Greg Knister]

what is the process for doing this . Ruff old paint hit with primer,sand smooth. hit with primer again and paint.

Any help would be appreciated.
Thanks Greg

[Greg Knister]

What I need to know is what grit paper to use and how much I have to rough it up and what grit to do the primer sanding . I am using a single stage paint

Thanks Greg

[jspbtown]

Well alot depends on the quality of the surface. If the paint is intact and its just a re-shoot you can scuff (400-600 grit), shoot some sealer and spray away.

[Greg Knister]

Could I use primer as a sealer

[marklaken]

Shooting primer as sealer depends - check your primer and paint tech sheet.

What grit to prep sand depends - check your primer and paint tech sheets.

Rust repairs? Dent repairs? Chipped paint repairs? Bare metal? - These will all affect what type of primer(s) you will need.
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Mark Laken
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[eyetzr]

The quality of the old paint is important. If it is perfect and just sand with 400 to 600 grit is spot on. I would spray a sealer coat so you have good adhesion. For the new paint.