How to waterproof a bathroom cabinet top - Woodworking Talk - Woodworkers Forum
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post #1 of 3 Old 07-11-2017, 05:55 PM Thread Starter
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How to waterproof a bathroom cabinet top

Hi All- this is my first time here and I am hoping you can help. I purchased a 'bath cabinet' for a vessel sink. The bath cabinet came finished, however, since we are putting a sink on top of it I am trying to figure out the best way to protect the wood top and limit the water damage caused by inadvertent splashing from the sink. According to the manufacturer the cabinet has an oil based finish with a NC sealer and topcoat. Should I add another coat of some type of varnish or dealer to further protect the wood surface? Or should I just leave it as is. Thank you for your advice.
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post #2 of 3 Old 07-11-2017, 06:55 PM
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That's a hard fix. The NC sealer and finish is lacquer which is barely water resistant. In order to make the transition from lacquer to varnish is with zinsser sealcoat. It's a dewaxed shellac which will bond to the lacquer and will allow another finish to adhere. Shellac is a product that really needs to be sprayed though and sealcoat doesn't come in a spray can. Still you would end up with lacquer and shellac underneath the finish both are not waterproof. The least little scratch and it will let water under the finish.

To really make it waterproof like it really needs the lacquer should be stripped off and another finish used. This adds more problem matching color and such. Your easiest solution probably would be to spray a pre-catalyzed lacquer over the top of the lacquer finish. A pre-catalyzed lacquer isn't completely waterproof but much more water resistant than nitrocellulose lacquer. With pre-catalyzed lacquer as long as you towel dried the water as much as possible it should hold up for a very long time.
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post #3 of 3 Old 07-14-2017, 11:27 PM
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Even though Zinsser's spray shellac isn't called Seal Coat, the can says that it is 100% wax free and can be used under polyurethane and other finishes.
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