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Richard:
The medium I used to use contained Damar - which is removeable. To keep anyone from possibly cleaning it too deep in the future, I used to mix up an isolating varnish of 50/50 Liquin and Rectified Turps and paint it on very thin. I have also done it with Galkyd and turps which I preferred.
I know that there is some concern about alkyds yellowing over time and a thick coat of liquin could be a problem some 50+ years hence if there are indeed any problems with it.
It comes down to a personal choice based on what feels right to you.
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