Q: I was planning on using oil based wiping varnish atop waterbased stain. Do I need to use shellac in between?
A: Nope. You can put oil based clear finish directly over any other finish, including waterbased acrylic, so there is no need for shellac or any other barrier coat between your waterbased stain and oil based topcoat, assuming the stain is fully dry before you proceed.
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