Painting over linseed putty with linseed paint

20 May 2016
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United Kingdom
I've been using linseed paint for a while now, and I'm very happy with it. However I've got a situation that's new to me - painting over some re-glazed glass. The glass will be set with linseed putty, and the standard advice is to leave the putty to harden for as long as you can before painting.

However, I assume this advice is based on the assumption that people will be using modern acrylic paints? If I'm painting over the linseed putty with linseed paint, can I just do it immediately? I've seen a video on youtube from a manufacturer of linseed putty/paints that recommends doing just this.

The second question I have is about whether to apply the first coat of paint (thinned) before the glazing (meaning I'm with unglazed windows for a few days while the paint dries), or if I can just brush some bog standard shellac/knotting primer onto the rebates, before glazing. Anyone with any direct experience of this?
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I used to use linseed putty for glazing, and I think the advice has always been to let it harden before painting. It's not a tip that arose since oil colours fell into disuse. I imagine that it would stay soft if covered up early. Some putty is excessively oily when you open the pack, and you have to roll it in newspaper to soak up the excess.

you are meant to put primer on the rebate before glazing.

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