Shellac Over Tacky Polyurethane

It dries very fast but is also easily.

Shellac over tacky polyurethane. Now use a sharp exacto knife and cross hatch each finish with cuts through the finish every 1 10 of an inch. Apply an oil based poly varnish over a section of each and a waterbourne poly varnish over another section of both. Then the finish goes into a tacky or sticky stage for an hour or longer. Adding a faster evaporating thinner doesn t speed this crosslinking.

The answer is to solve a problem. It is processed and sold as dry flakes pictured and dissolved in alcohol to make liquid shellac which is used as a brush on colorant food glaze and wood finish shellac functions as a tough natural primer sanding sealant tannin blocker odour blocker stain and high gloss varnish. Daniel drabek september 22 2010 5 03 pm marc another entertaining and educational video. My question is if it is still tacky in the morning can i polyurethane over it and it dry.

I think there s a big difference. Shellac is a resin secreted by the female lac bug on trees in the forests of india and thailand. Polyurethane and varnish vs. Thewoodwhisperer september 23 2010.

Shellac is a clear gloss finish that comes from the secretion of an insect and is mixed with alcohol. However after doing this the desk is slightly tacky and things don t slide very well on it. In order to help you distinguish the differences between each one this article discusses some of these finishes. Share improve this question follow edited oct 26 14 at 14 26.

It comes in many colors and can be used either as a finish or as a sealer. 546 2 2 gold badges 8 8 silver badges. Shellac also blocks the. Do the same at 90 degrees.

Shellac has wonderful blocking properties better than any other finish. If the finish is shellac the alcohol will dissolve it almost instantly. What can i do to reduce this stickiness. How to dry tacky varnish.

Although painters sometimes refer to oil or water based polyurethane finishes as varnishes the term varnish usually refers to a clear oil based alkyd finish. This is the length of time it takes for the oxygen induced crosslinking to occur. It blocks silicone contamination which causes fish eye odors for example from smoke or animal urine and residual wax extremely well. I used rustoleum s ultimate wood stain in dark walnut.

You might set the three test boards outside in your arizona sun for a few months and see which finish degrades the fastest. 20 3k 13 13 gold badges 81 81 silver badges 121 121 bronze badges. Let them both dry two weeks to develop full adhesion. I applied it about 4.

Asked aug 5 11 at 15 09. Shellac is a natural material harvested from lac beetles dissolved in denatured alcohol if it s a varnish the spot will react more slowly. When you apply polyurethane you notice that it stays wet on the surface for a short time as the thinner evaporates. Penetrating wood stains are not intended to be a surface finish.

To determine which finish is on the rail test in a hidden place using a q tip dipped in denatured alcohol. Early 20th century. Polyurethane over oil stain still tacky. Why use shellac under several coats of polyurethane or under any other finish.