Repairing Sandblast Damage

[68c10airstream]

Excellent article. If you want NO warpage use a pressure washer (minimum pressure of 2800 and 2.5 gpm) and an attachment from water cannon.com and use the abrasive of choice. The abrasive is drawn into a special end on the wand like a paint gun draws paint up from the cup (venturi principle) and cleans rust like you wouldn't believe. It can't warp because the water keeps it cool. Would you rather blast with air at 100-150 psi and warp it, or blast with 2800 psi with water and NOT warp it???? Been there done that, never going back to 100-150 psi system again. Look up on youtube under wet sandblasting.

[68c10airstream]

I should add that even OSHA considers water sandblasting safe, no respirator needed because there is no dust. A good pair of goggles that cover all the way around is all you need. I blasted in the driveway, next day sand is dry, swept it up, sifted it clean and re-used it. You will get wet/sandy but brushes off easy!

[tinydb84]

Originally Posted by 68c10airstream

Excellent article. If you want NO warpage use a pressure washer (minimum pressure of 2800 and 2.5 gpm) and an attachment from water cannon.com and use the abrasive of choice. The abrasive is drawn into a special end on the wand like a paint gun draws paint up from the cup (venturi principle) and cleans rust like you wouldn't believe. It can't warp because the water keeps it cool. Would you rather blast with air at 100-150 psi and warp it, or blast with 2800 psi with water and NOT warp it???? Been there done that, never going back to 100-150 psi system again. Look up on youtube under wet sandblasting.

In the beginning of the post he shows that temperature isnt the cause of the warping. It is the stretching of the metal due to the abrasive media hitting the panel.