Not necessarily...the other post was talking about taking a bunch of
returned or other low-cost paint and using it as primer...was mixing all
the various things he found together--obviously, that would have to be
at least all an oil- or latex-based to have any chance of mixing well...
There are both oil and latex primers suited for either oil or latex
topcoats. The particular primer will say whether it is/is not suitable
for a given top coat.
In addition to the excellent advice you've gotten from others, I use a
sanding sealer, especially on non-veneered plywood, before priming.
This will raise the loose grain, which you then lightly sand off
before priming. It makes for a smoother and more consistent finish and
one that requires less paint.
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