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Frame sealant is the quick way, generally acrylic these days as the silicon type doesn't accept paint well and doesn't weather well either. On my own windows I used Toupret flexible reinforced filler - Fibracyl. It shrinks and takes time to dry so it can take a few days to get to a finished level, it's also doesn't sand well.
I use zinnser one coat gloss white on exterior windows these days. It doesn't cover in one coat but it's durable and easy to apply.
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Cheers @Airhead - the Fibracyl filler, is that for any minor filling that needs to be done? i.e You'd also use an acrylic frame sealant too?
I have old sash windows which I'll be sanding down, refurbing a little and repainting both inside and out. Wondering what sort of caulk/sealant should be used around where the frame meets the window? Paging @Airhead as I think this is your bag?