Help with paint prep, Need help with Ospho use Options

[sixaddict]

Have a glass blasted car in for paint. Needed to apply Ospho for surface light rust that developed. We are trying to determine how to neutralize before epoxy primer goes on.
Instructions say brush off dry powder then wipe with mineral spirits. In another section it says to etch wet with Ospho for 30 minutes then wash down with water.
That seems risky due to flash rust.
Anyone have experience to recommend which way to go.
TIA
Terry

[bbrock]

Older bottles of Ospho I bought said to neutralize with water or mineral spirits, but the last bottles I bought just said to let it dry. I found spraying with water and wiping with a damp rag worked best (see the etching clean metal instructions in the link
@Montreal914 posted). When the Ospho coating is wetted with water, it develops a phosphorous powder coating. I removed the powder with a red scotch bright pad which left a smooth, etched surface. Just letting it dry sometimes left an uneven coating and I still worried about not neutralizing. Just try a small area with water and see how it goes. I didn't have any trouble with flash rust. In fact, after Ospho treatment I left the car bare in our dry climate for months and still no rust.