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These days I rarely use anything higher than 120 grit. Too slow, too many sheets, not enough bite, and hard on the fingers. 40 or 60 grit knocks it down flat.
I second the TSP, but not sure even oil based paint will stick to varnish. You can put quality latex topcoat over oil primer, but oil won't stick to water primer.
Might give a quick call to a paint store or two and ask about adhesion. If you primer, use the same shade or lighter depending on the color and saturation(eg yellow topcoat on white primer) for better coverage.
I discovered this once after spraying the third expensive coat of light yellow/green on our porch wicker, but it still wasn't yellow.
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Meanwhile other things are still happening.
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