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We'd been hearing rumors that Z-poxy Finishing Resin was a great filler and sealer, but it was luthier Tim McKnight who wrote and insisted that we carry it. It is the filler of choice in Robbie O'Brien's finishing DVD as well.
Z-poxy is used much like our System Three epoxy filler. It's great advantage is that it is much more forgiving when it comes to mix ratios. With the System Three filler, we recommend using a digital scale to get the ratios right, but with Z-poxy, you can "eyeball" it. The only disadvantage (some consider it an advantage) is that it is not 100% clear and will add a subtle amber warmth to the color of the wood.
APPLICATION: Simply apply, as thinly as possible, across the grain with a squeegee or old credit card. Press the Z-poxy into the pores, allow to dry overnight and then sand with 400 grit paper. Apply a second (or third) coat until you have a perfectly flat surface. The last coat can be thinned with alcohol and wiped on with a towel. The alcohol will evaporate leaving a glassy surface. Be sure you do NOT sand to the bare wood when sanding. Then finish with de-waxed shellac, lacquer or urethane.
NOTE: Though no builders have reported adhesion problems to date, O'Brien recommends using a coat of shellac between the Z-poxy and the top coat for added insurance and always test on scrap when using new products. Z-poxy can be thickened with our FST1Q Silica thickener or it can be thinned with alcohol.