[Leopoldo Benavidez]

Mary,

Yes, you can use retouch varnish first over areas that you want to paint into, or add a bit of any of the resins to your tube paint nuts on your palette, like dammar, mastic, copal, canada balsam, etc. Resins are sticky and think of them like a glue. Tube paints having oil in them, as their vehicle only, might present some adhering problems down the road over a dried film of paint. Dammar is by far the cheapest and easiest to procure! Good luck..........L