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post #1 of 4 Old 05-20-2018, 07:48 AM Thread Starter
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spar urethane

I used water based spar urethane on unfinished wood that is being used for kitchen countertops. I applied four thin costs sanding between each, letting finish cure for one week. A glass of water left on counter caused it to make a purplish white ring. What can I apply over this finish to prevent water damage? I used Min-Wax Pro-series Spar Urethane.
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post #2 of 4 Old 05-20-2018, 08:11 AM
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Originally Posted by gordoncox View Post
I used water based spar urethane on unfinished wood that is being used for kitchen countertops. I applied four thin costs sanding between each, letting finish cure for one week. A glass of water left on counter caused it to make a purplish white ring. What can I apply over this finish to prevent water damage? I used Min-Wax Pro-series Spar Urethane.
It's not the cause of the problem but you shouldn't use a spar varnish for interior projects. A spar is deliberately made soft to deal with more wood movement of being outdoors. For a countertop you need a hard finish.

The purple color is odd but if you are getting water damage the finish isn't thick enough. You should have a finish that is at least 3 mils thick over the surface of the wood. 3 mils is about the thickness of a lawn and leaf trash bag. Four coats may sound like a lot but water based finishes are a lot thinner than their oil based counterpart. Depending on how it is applied it might take 3 to 4 times as many coats to achieve the same finish so your countertops might should have 6 to 8 coats.

The purple color, is there purple in the natural color of the wood or stain that was used? The only thing I can think of is the water got to the wood and brought some pigment to the surface.
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post #3 of 4 Old 05-20-2018, 08:36 AM Thread Starter
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Once you have used the spar urethane,is that your only option of sealer? Is there any other type finishing product that can be applied over the spar? If you several more costs of the spar will that take care of the water rings?
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post #4 of 4 Old 05-20-2018, 08:46 AM
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Once you have used the spar urethane,is that your only option of sealer? Is there any other type finishing product that can be applied over the spar? If you several more costs of the spar will that take care of the water rings?
A lot depends on how thick the spar is now. If it's still thin enough you could put a water based polyurethane over the top. Not being there and seeing where you are it's difficult to recommend whether or not to go that direction.
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