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Quote de gr8fl4porsche
If the trim is properly cleaned and sanded, no primer is necessary. The right water based topcoat will adhere just fine. I am not familiar with CA products but see if SW in CA carries Solo. Comes in a variety of sheens and bases, flows nice and sticks like glue.
Lots of people will tell you that priming is necessary. If you believe them, try a sample first. Try with and without to see for yourself.
Clean, lightly sand, apply primer or finish, let dry for a few days and perform an adhesion test.
Water based paint right over oil you are suggesting?
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If you pick the right product, adhesion will be fine. Don't use a standard acrylic semi gloss formulated for walls and trim. Go for something meant to adhere to anything.
I recently finished a couple projects where existing oil based paint and varnished trim was to be coated.
Prep work was almost zero and primer was not even considered.
SW Solo on one and Porter Advantage 900 on the other. Both turned out great and you couldn't get the paint off if you tried.