How do you make sure that old can of finish will work with the new stuff you want to use as a topcoat? Lay one coat of finish over the other, in the order you plan to use them. Allow each coat to dry before proceeding. Then score the surface across the grain and see if you can lift one layer off the other with a sharp chisel. If you can, don't use them together.
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Wood finishing can be tricky and after spending hours on building your project you want to be sure that you get the best outcome possible. In The Complete Guide To Wood Finishing you will learn how to get beautiful, professional results no matter what your project is, even if you have never tried your hand at wood finishing before. You will learn about every step in the wood finishing process from a professional wood finisher with years of experience.