Will I be successful putting oil based poly over sanded shellac?
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Yes!
I was hoping so.
it's nice that everything sticks well to shelac....as long as what you have is really shelac as sometimes any number of finishes might appear to be shelac. If in doubt it's not a bad idea to add a layer of shelac since shelac sticks to everything and everything sticks to shelac.
If you can find (Zinnser) dewaxed stuff then truely anything will stick to it.
Shelac is a must over pine knots if you don't want the sap to come right through your finish (can be seen on trim and furniture painted white)
John
Poly does stick to shellac reasonably well, but it sticks best to de-waxed shellac, like Zinnser SealCoat.
If you used a regular shellac, you should consider adding a coat of SealCoat to be doubly sure that the poly will stick
I'm so used to using nothing but dewaxed shelac that I forgot to mention there is a difference between waxed and dewaxed. :)