Shelf finish for plastic models - Woodworking Talk - Woodworkers Forum
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post #1 of 7 Old 05-24-2020, 07:36 PM Thread Starter
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Shelf finish for plastic models

I built my wife a few display cabinets for her model horses, and after the plastic models have sat on the shelf for extended periods of time they stick to the finish. The shelves are 3/4 oak vaneer plywood. I finished them with minwax oil stain and topcoated with minwax oil based polyurethane. I am building another cabinet and trying to decide how to finish the shelves, so the models won't stick to it. I think it's a chemical reaction because the cabinets range from 3 to 6 years old, and the age of the finish doesn't seem to be a factor. Would a water based polycrylic finish work, so the plastic hooves don't stick?
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post #2 of 7 Old 05-24-2020, 08:04 PM
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Not a big fan of polycrylic. I do use water born finishes, but you can't buy them in big box stores. Before polycrylic I would probably try a brushing lacquer, or even rattle can lacquer. I believe that would work as nitrocellulose has been used for decades on guitars and such and regularly makes contact with plastic parts, such as pick guards.
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post #3 of 7 Old 05-24-2020, 08:48 PM Thread Starter
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Thanks B Coll, I didn't think about lacquer . My wife suggested maybe use the oil stain and no top coat?.
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post #4 of 7 Old 05-25-2020, 10:42 PM
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Have you tried waxing it?

It seems odd to me that they’d stick to fully cured poly, but I guess anything can happen.

One of my tricks to keep stuff from sticking to acrylic enamel was to put a good coat of wax on it. Maybe you could try that with the poly.
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post #5 of 7 Old 05-26-2020, 07:19 AM
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Quote:
Originally Posted by B Coll View Post
..................... I would probably try a brushing lacquer, or even rattle can lacquer. I believe that would work as nitrocellulose has been used for decades on guitars and such and regularly makes contact with plastic parts, such as pick guards.
Add to that .............it's been used for almost a century on kitchen table tops.

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post #6 of 7 Old 05-26-2020, 05:56 PM Thread Starter
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I'm going to not apply any top coat on the stain, and see how that goes. I like the idea of using a wax I might try that another time, thanks Quickstep.

I agree with Tony B it doesn't make sense, but maybe if one of these models were left on a kitchen table for a year it might stick to it? Got me.
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post #7 of 7 Old 05-26-2020, 10:38 PM
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[QUOTE=Roybrew;2113691.....maybe if one of these models were left on a kitchen table for a year it might stick to it? Got me.[/QUOTE]

Not unless it had thinner or some other kind of solvent, it should not.
If you use a wax or any thing other than a hard finish, it will definitely stick again.

I just went back and re-read your original post "...............I finished them with minwax oil stain and topcoated with minwax oil based polyurethane...........". It is possible that you used too much stain and it didn't really dry properly. This could have reacted with the poly and prevented the poly from completely curing. A remote possibility, but still, a possibility.
I dont ever use oil stains, matter of fact, I rarely ever use any stain. But if I do, I use aniline or alcohol/solvent based stains. they take some getting used to, but they dry almost instantly.

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