flash off?
Hotshot
Joined: Apr 2004
Posts: 13,589
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From: NW burbs of chicago
Flash-Off
After paint application and prior to curing, the solvents need to “flash-off” to prevent bubbling of solvent evaporating from the paint as higher temperatures are applied in the curing oven. Flash-off normally happens at ambient temperatures in an enclosed, ventilated area. The exhaust of this enclosure is discharged into the atmosphere (or to an air-pollution-control system).
After paint application and prior to curing, the solvents need to “flash-off” to prevent bubbling of solvent evaporating from the paint as higher temperatures are applied in the curing oven. Flash-off normally happens at ambient temperatures in an enclosed, ventilated area. The exhaust of this enclosure is discharged into the atmosphere (or to an air-pollution-control system).
Elder User
Joined: Nov 2003
Posts: 719
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From: green bay, WI
Or in english, a time you let the paint sit before applying another coat, so enough solvents leave that you won't trap them with you next coat. If coats are applied to heavy and too short of a time is allowed between coats, you can get what is called solvent popping when solvent escape through the next following layers, causing a bunch of tiny blisters eventually leaving a bunch of little pinholes where the solvents tried to escape. If you do get lucky and don't get solvent pop from this, heavy coats and trapped sovents will make the paint dry and cure slower. Trapped solvents and pop can also happen if too fast a reducer is choosen and the paint will dry on the top before solvent has had a chance to escape. A slower solvent will leave the top open longer for solvent to escape. The techsheets for the paint will give a flash time between coats, but it is only a guideline. Better to wait a little longer between coats to be on the safe side. Humidity can slow down flash times. And dark colors like black are slower to flash.
Last edited by kenseth17; Jul 7, 2006 at 09:48 PM.
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