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That's interesting Dan, in the product description it says exactly the opposite:
It seals all types of wood including oak, maple, chestnut, mahogany, walnut, birch, poplar, cherry, exotic woods,...

There are products specifically designed to seal wood prior to finishing. They are called sanding sealers. Here's one that looks pretty good: Buy SealCoat Universal Sanding Sealer, 1 Quart, SealCoat...