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Yes you can. You can use either oil based or a water based. I prefer a water based myself.
they are all water based
A Sharpie permanent marker is not water based. It is alcohol based and it is waterproof.
It will protect the paint as long as you use a water based varnish, never use oil based varnish over water based paint.
Tip: "water based enamel= water based finish".
"oil based enamel= oil based finish".
It is based on earths water