Sandblasting ruins the rust protection that the galvanizing provides.
Seems to me they used to "pickle" the zinc finish with vinegar and
then paint would stick.
You can always try it on a piece of old furnace ductwork to be sure.
Another option is to have the running boards powdercoated with a primer
coat. Not cheap unless you have your own equipment, but it works great. You
can get the primer powder from www.columbiacoatings.com.
I used to work as as tinsmith (roofing) if yopu want to paint
galvanized steel you could use a solution of muriatic acid diluted
To obtain the right solution of acid you put piece of zinc in the acid
until some zinc dos not go away, it is then ok to put on the steel,
after you rince with clear water .
Excuse my english I am french speaking
The proper way to do it is:
Go to an auto body supply store that sells PPG products in your area, get
metal conditioner for galvanized metal.
The vinegar, though once the best fix, is dated and won't work well. Also
get PPG Epoxy primer sealer in the color that closest resembles the color
you're going to paint the vehicle.
That shit sticks to anything, it will even stick bananas to icecream.
Thanks all for the suggestions. I've used the vinegar treatment in the
past on some galvanized square tubing, but I'm wasn't sure if maybe
there was a better product for this. I've got some of DuPont's
VariPrime self etching primer which I've been told should work well
after the metal conditioner is applied. Anyone have a product name for
the metal conditioner that will work with this? Guess they should know
at the paint supply......thanks again!
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