After sandblasting a body how do you stop or prevent rust prior to priming the body? I was told to sandblast, do all metal straightening, weld new panels and then walnut blast the body to prevent warping. How do I stop rust while the new panels are being welded in?
Keep it in a dry garage
May depend on local climate, but blasted steel parts never rusts in my unheated but isolated garage, while unpainted steel parts tends to rust in my other unisolated storage shed.
If you plan to walnut blast before final paint anyway, you may as well paint it temporarily with some cheap spray can primer. Maybe the project gets held up and has to be moved to other storage for some time..
Get an etch primer on it as soon as blasting is complete. It's easy to clean off wherever you need to weld or you can mask those areas if you know in advance where you need to cut and weld.
Agree with Walter. I would blow it off with air, wipe it down with MEK, then shoot it with a good self etching zinc rich primer to keep everything from rusting until you are ready to work on it.
metal prep thru por 15 spray it on with a sprayer bottle
Jasco Prep and Prime will remove any flash rust if there is any and will also prevent it from forming if you don't want to prime yet. Lowes carries it as well as Ace Hardware. It's less than $7 a quart.
Be aware that some primers do not bond as well to metal that has been "metal-preped with anti-rusting chemicals. DP epoxy primers, for instance.