How To Repair Table Top Varnish With Heat Damage
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This is a oestrus mark on a catalyzed finish that resists any type of repair.
I got a call from a long-time customer asking me to come past and encounter if I could fix the estrus damage to her dining table. I was really quite familiar with that tabular array. Twenty years previously she told me about an original Chippendale dining table and twelve chairs she and her married man had only bought from an antique dealer in a neighboring state.
Needless to say, I was really curious. The odds of twelve matching original Chippendale chairs surviving for several hundred years are minuscule, actually fifty-fifty less. Then I asked if I could come up by to expect at information technology. The couple was in the process of taking everything out of boxes when I got at that place.
If you accept been around antique furniture for many years, as I had, you learn to recognize most frauds very quickly. Equally I've pointed out previously in this blog, faking several hundred years of age requires a huge amount of skill. Then I was suspicious.
In this case, it didn't require any more than just walking into the room and glancing at the dining set to know immediately that it was new.
Nevertheless, I did spend some time looking more than closely, just to be sure. The tabular array was just partly assembled, and then the married man and I turned it upside downward to get a await at the underside. There information technology was stamped in large black letters: Fabricated in Korea. Very sad. I offered my expertise if they should decide to sue the antique dealer. But they didn't want to. They notwithstanding liked the dining set, so they decided to proceed it.
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Back to the heat damage. Information technology had been caused past a pizza in a pizza box that had been placed on the table.
A few years previously, I had been visiting my son during a time when he was having a big political party. He had ordered half-a-dozen pizzas delivered and had spread them out on the dining table. Later, when he and his wife were cleaning upwardly, they discovered big white marks under each pizza box. The finish on the table was nitrocellulose lacquer, so at that place were two ways to remove the impairment. The easy style was to spray some butyl cellosolve onto the white areas. Butyl cellosolve is a very deadening evaporating solvent for lacquer. The solvent puts the lacquer back into solution and so it has time to reconstitute itself, and the white areas disappear.
You tin buy aerosols of butyl cellosolve that get by a number of merchandise names oftentimes indicating that they remove "blush," which is the finish turning white. Amazon carries "Chroma Eraser" from Behlen's.
You have to be very careful with this product considering if y'all go the finish too moisture, information technology will introduce fish-centre (craters) if the finish has been polished with a piece of furniture polish that contains silicone, which most article of furniture polishes practice.
And so not having access to the aerosol solvent and knowing that silicone furniture polishes were common in that house, I chose to use the other method of getting rid of the white marks: abrade the stop with fine steel wool. It took some elbow grease, but I succeeded. Unfortunately, I didn't take any pictures.
The situation with the Korean Chippendale reproduction was different, yet. The finish was a catalyzed (conversion) varnish. I could tell this by two methods. Get-go, I knew that about furniture made in and imported from Asia is finished with this cease. And second, I did a test on an inconspicuous area past dabbing on a petty lacquer thinner. It did nada.
So I was stuck. A catalyzed varnish is very resistant to damage from anything. But as the cease ages, it tin become susceptible to white marks. Think of these finishes as plastics, which they are. Plastics deteriorate. In this example, the hot pizza was too much for it. Withal, the end was durable plenty to resist both the solvent and the abrading. There was nothing to practise but refinish the tabletop, which I told my client. I just didn't want to exist the 1 to do this.
– Bob Flexner
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How To Repair Table Top Varnish With Heat Damage,
Source: https://www.popularwoodworking.com/flexner-on-finishing-woodworking-blogs/heat-marks-on-catalyzed-varnish-finishes-these-can-be-impossible-to-remove/
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