Tech Questions - Preparation of Wood Surfaces


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Do wood surfaces require any special preparation prior to covering?

Yes, you must protect the wood from the chemicals in the covering process. The best way to do this is to apply epoxy varnish.

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Can I brush the varnish on the surface?

Yes, brushing is acceptable. After mixing the varnish (Poly-Fiber EV-400) with the catalyst (EV-410) you should the mixture about 25% using E-500 Epoxy Reducer. The first coat should be thinned to allow it to properly penetrate the wood and seal it. An additional coat is recommended. You can also spray the varnish on if you prefer.

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How long will it take the varnish to dry?

It will dry to the touch in about 3-5 hours depending upon temperature. Full cure of the epoxy will take about 1 week.

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Can I begin covering the surface after the varnish has dried?

You should wait at least 1 week for the epoxy to fully cure. That will ensure full chemical protection for the wood surface.

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Can I use spar varnish to coat the wood?

No, spar varnish will not provide adequate protection against the chemicals used for fabric covering.

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What if I have spar varnish in place on my surfaces?

Normally, you can sand the surface and then apply epoxy varnish over the spar varnish. Occasionally, the epoxy varnish will "lift" the old spar varnish. If this is the case you should strip the spar varnish off of the areas where fabric will touch and then recoat using epoxy varnish.

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Do I need to do anything unusual to large wooden surfaces before I cover them with fabric?

Yes, after you have allowed the epoxy varnish to cure you should then apply a minimum of 2 coats of Poly-Brush on the surface prior to installing the fabric. This is a very important step, particularly if you cannot attach the fabric to a wing surface using rib lacing, etc.

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What about filling holes and smoothing wooden surfaces?

Use Poly-Fiber's SuperFil to fill all holes and smooth depressions, etc. This lightweight epoxy filler is excellent for use on wood. It can be sanded smooth after about 8 hours of drying time.

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