polyurethane yellowing before my eyes

sunnytopMarch 29, 2009

I sprayed satin polyurethane I purchased from a craft store, no idea if it is oil or waterbased, on a strip of wood painted white with painted stenciling. It turned yellow before my eyes by the time I got to the third coat. I thought polyurethane was not supposed to yellow. Was I mistaken?

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bobismyuncle

Yes, you were mistaken. Oil-based polyurethane "ambers."

    Bookmark   March 30, 2009 at 6:32AM
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sombreuil_mongrel

Water based poly can pull sap or stains out of wood and appear to be yellowing. In that case it would not be the varnish, but the wood.
Casey

    Bookmark   March 30, 2009 at 8:20PM
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