A little Japan dryer can't hurt. I've never tried adding shellack and did not know it was compatable with tar and oil. Varnish is and old varnish has no other use. Makes for a nice hard finish with the turps carrying the oil more into the siezing's fibres.
Many of the old slushes that had no varnish do indeed get messy, especially on a hot day.
I'd still not use net dip and if you don't have old stuff, experiment with the cheapest traditional marine varnish you can find.
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