Very dumb mistake... Clear preservative solution over tung oil on child's stool - Woodworking Talk - Woodworkers Forum
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post #1 of 7 Old 09-24-2020, 08:47 AM Thread Starter
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Very dumb mistake... Clear preservative solution over tung oil on child's stool

I'm an idiot. I just tried to put a polyurethane coat on a child's stool over tung oil, but then realized I used the clear preservative solution I used on a garden gate last month instead of polyurethane. Have I completed messed up this project? I'm obviously concerned about toxicity for the kid. Here's the brand of preservative I used: https://weekshomehardware.ca/p/gener...d-preservative

And here's the tung oil, if it helps: https://www.homehardware.ca/en/500ml...results%20page

I've been working on it for months and it's supposed to be my nephew's first birthday present (on Saturday). Can I strip the preservative without stripping the tung oil? Can I just put a coat of poly over the preservative solution? Can I sand the preservative down? I'm worried about the toxicity of the clear preservative solution for the kiddo, but maybe that's not a real concern, especially if I apply poly over it?

Thanks for your help... I feel terrible.

Last edited by Sol Klein; 09-24-2020 at 09:16 AM. Reason: Adding clarification
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post #2 of 7 Old 09-24-2020, 10:01 AM
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From the link you provided; "Paintable wood preservative and water repellent for above ground, exterior use only"

This to me, would suggest it is toxic. Best source for info would be the MDS for this product.

As to presenting this for the birthday party Saturday, sure take it along, let everyone see it but explain that you have to take it back home with you to "complete" the finishing. Then do what ever it takes to correct the situation. I suspect the best course of action would be a complete strip and back to square one.

For myself, any covering of a toxic substance would be insufficient protection. I've seen how deep kiddos can chew.
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post #3 of 7 Old 09-24-2020, 10:10 AM Thread Starter
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Thanks. I'm in touch with the manufacturer about this. They said they weren't even sure you can really strip it and start over because it's absorbed by the wood, but that doesn't seem right to me.
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post #4 of 7 Old 09-24-2020, 10:25 AM
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speaking of oil, have you looked at the MSDS for your vendorís Tung Oil. Since kiddos may chew on it, its a consideration.

I mention this since I got reprimanded for using Boiled Linseed Oil on a butcher block cutting board.

Retired engineer-bureaucrat in Oakland, CA. Been working with wood since the 1960's. From the 50's if you count the scrap woodpile on the farm!
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post #5 of 7 Old 09-24-2020, 10:26 AM
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Quote:
Originally Posted by Sol Klein View Post
Thanks. I'm in touch with the manufacturer about this. They said they weren't even sure you can really strip it and start over because it's absorbed by the wood, but that doesn't seem right to me.
I understand your pain, you feel like an idiot. You are not an idiot, we all make our share of stupid moves. Take the stool along, explain that is only a sample and the child will get a properly finished one. If that means starting an entire rebuild, so be it. Everyone will appreciate both your honesty and the effort you have put into the project.
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post #6 of 7 Old 09-24-2020, 10:48 AM Thread Starter
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Thanks for the encouragement :) I may or may not have shed a few tears for this stupid stool that's been in process for a year cuz I haven't been able to get back into the woodshop for six months due to... y'know, everything.

I spoke directly to the manufacturer, and they say that if I wait until it dries completely, I can apply polyurethane over top and it should be completely safe. The toxicity is really only when it's still wet, and the polyurethane will give an added layer of safety. So that's gonna be my plan. Thanks so much for your help again!
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post #7 of 7 Old 09-24-2020, 10:50 AM Thread Starter
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Quote:
Originally Posted by kiwi_outdoors View Post
speaking of oil, have you looked at the MSDS for your vendorís Tung Oil. Since kiddos may chew on it, its a consideration.

I mention this since I got reprimanded for using Boiled Linseed Oil on a butcher block cutting board.
Yes, I did confirm that the tung oil is safe for this project (i.e. food-safe even if the kiddo isn't supposed to be eating off it). As far as I can tell, raw linseed oil is also food-safe, it's just the boiled stuff that isn't. Thanks for your concern
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