Air Compressor Tank + !

I finally had a free minute to test the air tank. I used a 4 ton porta power I got at a garage sale for $30. I filled it with water and dishsoap, then pushed it up to 210 psi with the porta power.

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This weekend it will get blasted and painted with Majic tractor paint form TSC.
A question - the paint is an enamel, that will be reduced to spray with a catalyst added. It will be on a non mobile tank that has a small shed over it, so not a lot of weather.
It will be applied on a sand blasted surface.
Do I need to prime the steel first, or can I apply directly to the steel?


Sent from somwhere in east Texas by Jake!
 
I never thought of using my porta-power for pressure testing. Pretty neat trick.
 
I use to hydro small runs of pipe fabrication, and valves this way. The dishsoap is to break up the oil introduced into the water. Plus discharge water gets run through oil pig mats and oil boomers.

Sent from somwhere in east Texas by Jake!
 
Depending on how long you want the paint to last. Use a metal prep ( phosphoric acid ) then primer and then paint.
Contact a local auto body supply house and see what they recommend.
The metal prep etches the metal, ( allows better paint adhesion) and neutralizes rust. I would suggest a good acrylic enamel paint and your good for many years
 
You can get etching primer. Has the phosphoric acid in it, but some argue against it. I'm not sure why, but seems to me a wash with a metal prep like Jasco Prep and Primer wouldn't work well under the alkyd topcoat. It does a phos job on the bare metal. Henry Ford used it on Model T's :)
 
If it's been blasted you shouldn't need to etch it. The blasted surface will be great for adhesion. Just wipe it down with with lacquer thinner or similar solvent before priming. Any decent primer from the hardware store, i.e. Rustoleum, etc. should work fine. Mike
 
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