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Spraying over latex paint2/20/21
I do a lot of cabinet refinishing.I usually get jobs where it is a factory cabinet that is stained and the homeowners wants to have them painted
When it comes to refinishing (l've done a lot of it), the rule l've ways lived by is; "never put something harder over something softer(more flexible) as it's akin to painting a balloon...as the top coat will crack. Look into using SW's Emerald urethane acrylic; flexible and eventually dries/cures pretty hard.
On another note,I have an Asturo spray gun with a 2.5 nozzle and thinking of using it to spray the Emerald
The 2.5 will work great. I usually break out the airless using a 410 fine finish low pressure (those low pressure tips from Graco are amazing) when spraying paint but if l'm just spraying 1 door l have Sata 1000b with a 2.0 that sprays the Emerald great with just a little water added.
Maybe a bit low tech but I'd prime with Bin and then top coat with the latex. I've never had a Bin (white shellac) bonding coat fail on interior use, and the latex will adhere to it just fine.
When we spray latex we use a a 1.4mm tip. The latex is thinned with 10% water. Spray it, let it dry. Dry sand with 600 grit and spray it again.