Flash rust: why bare steel turns orange overnight
Wet blasting leaves clean, bare steel, and bare wet steel starts to rust within hours. Treat, wipe and prime in the right order and it never gets the chance.
Wet blasting keeps panels cool and the air clear, but it leaves water on bare metal. Bare wet steel flash rusts within hours, so the finish starts the moment the blasting stops.
The order that works
- Blast down to bare metal.
- Treat it: rust inhibitor in the last rinse, then AP1 on the bare steel.
- Wipe it down: no sand, no water left in seams.
- Prime the same day.
What each product does
- Rust inhibitor in the last rinse buys you up to a week before primer.
- AP1 on bare metal stops flash rust and preps the surface.
- An HVLP gun gets primer on the same day.
Dry every seam
Water hides in rails, seams and pinch welds. Blow it out before you treat, or the rust comes back from the inside.
See it happen: the rust clock in step 9 of the blasting guide shows bare steel with and without inhibitor over a week.
