Quote:
Originally Posted by Cptcave
I thought ospho was a gel. I'm ordering a 3m respirator and cartridges with my acid. I've got protective goggles already.
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I do alot of sandblasting with a wet system called the "farrow" wetblaster.
Wet meaning I fill the pot with water and media resulting in so no sand dust cloud while blasting.
I spray OSPHO on everything that I blast that is steel primarily to prevent flash rusting.
On heavy scaly steel, scrape away as much as possible by hand with a scraper and a hammer. Clean and then spray on the OSPHO with a pump sprayer but first make real sure you know which way the wind is blowing so you don't spray it onto yourself!
Once it dries go back under the bus and look for more scaling, rinse and repeat, scrape away anymore scaling!
You might have to do this 3 or 4 times to get it down to a minimal rust as possible.
If after all that spraying the OSPHO turns into a white crystal powder on the steel, no worries either power wash it off or use a stiff brush and remove what you can.
Don't worry about that fresh coat of water from the pressure washer as the OSPHO has already neutralized the rusting process and once the water dries you will be spraying OSPHO on more time anyways.
Once your done make sure you seal the steel with a quality direct to metal epoxy primer.
OSPHO also will "etch" the metal so any paint you apply will adhere much better.
A cheap harbor freight airless paint sprayer works great for this!
Rustoleum rusty metal primer works good to but you will also want to seal that with a decent epoxy paint. the "epoxy" will help prevent moisture from getting to the metal. Regular paint is pourous and epoxy is not.
I would wear good PPE equipment, 3m white paper suit, respirator, goggles and yes, a face shield too!
When I blast I wear a blast suit, blast helmet that is fresh air feed.
If your gonna play, play safe!
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