Yes, Acrylic Undercoat can be used over previously painted surfaces (apart from varnish & laquer). I find the best Acrylic Undercoat is Leyland version. I have used Dulux Trade High Gloss over Leyland Acrylic Undercoat with no problems. I use the Leyland version as the Dulux version has terrible covering power. Just make sure u rub down the previously coated paint before applying Leyland Acrylic Undercoat.
Or if you are old fashioned like me, you will use oil based. Don't get me wrong, i've used a lot of acrylic in the past but if i'n not in a hurry, I prefer the original way. Just feel you would have to do a lot of rubbing down.
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