Reply by CaptainKlutz

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Posted on Strange behavior in finish when HVLP spraying

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5023 posts in 2778 days

#1 posted 12-09-2019 03:01 AM

+1 see tiny popped bubbles.
Also see orange peel in other areas.

Orange peel AND bubbles are often related to moisture intrusion while spraying an oil base.

Orange peel alone is usually due less than optimal atomization, where solvent(s) are evaporating before paint could level out. Common solution (besides better spraying) is to add a reducer that is blend of solvents that evaporate at different rates to aid flow out based on spraying conditions. Not using the proper reducing solvent for spraying only makes the job harder. Instead of paint thinner, SW sells several reducers for oil base paints.

One puzzle: The bubble defects on top piece appear in straight lines that would aligned with sap/heart wood boundaries in underlying wood. Which could also mean that the wood grain had water/solvent in pores, that was released while spraying. No way to know if due to over sanding primer or not? Could be related to pores in paint holding more material due too heavy of coating and more solvent evaporating after paint had flowed out.

One spraying tip: you want a uniform primer surface under paint. Auto body work always sprays one final primer/ sealer coat – with zero sanding, before the put down base coat. The sealer lets you cover any variation in surface absorption created by sanding.

Best Luck.

-- If it wasn't for bad luck, I wouldn't have no luck at all, Doom, despair, agony on me… - Albert King - Born Under a Bad Sign released 1967

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