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Wood coaster finish (Read 232 times)
 
Andrew Abercrombie
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Wood coaster finish
Sep 1st, 2018 at 10:20am
 
Hey everyone, I’m making some coasters and want to know what finish should be applied for waterproofing and also mild heat such as mugs, etc.

Thanks!

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Don Stephan
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Re: Wood coaster finish
Reply #1 - Sep 1st, 2018 at 11:28am
 
Whatever you eventually decide to try, I would heartily suggest some tests of the cured finish on some scrap wood first.

It's likely hard to find, and expensive, but you might consider unfinished teak, to avoid all together the exposure issues.  My first thought was epoxy, but getting a blemish free epoxy finish might be near impossible.
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Ed Weber
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Re: Wood coaster finish
Reply #2 - Sep 1st, 2018 at 1:42pm
 
I would suggest a counter-top finish like Emmet's Good Stuff
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Andrew Abercrombie
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Re: Wood coaster finish
Reply #3 - Sep 1st, 2018 at 7:23pm
 
FYI I should’ve mentioned I already have wood, Apple, cedar and elm.
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A:) Let's take roll call to see if we're all here.
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A:) Right, let the record show that we are here.
C:) Who?
 
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Derik Mittag
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Re: Wood coaster finish
Reply #4 - Sep 1st, 2018 at 9:26pm
 
I've used polyurethane, brushed it on. Haven't had any problems yet, used three coats. Might want to experiment a bit.
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Mike Nathal
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Re: Wood coaster finish
Reply #5 - Sep 2nd, 2018 at 7:14am
 
oil base wipe on poly should be fine.  I have a travel mug with WOP and it still looks good after about 5 years of constant use
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Louie Powell
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Re: Wood coaster finish
Reply #6 - Sep 2nd, 2018 at 9:06am
 
OP's specification mentioned resistance to both water and heat. 

Ed suggested a counter top finish.  That would certainly be a good finish, but it might be overkill.  There is a big difference between the heat associated with putting a hot pot on a counter, and the heat from a mug of coffee or tea.  Finishes like polyurethane leave a plastic film on the surface that could be destroyed by a hot pot.  But I suspect that poly (either water or solvent) would be fine with a cup of coffee.  And for that matter, I suspect that the amount of heat that would be transferred from a cup of coffee would be well within the capabilities of a good penetrating oil finish.

As for water resistance, either the finish must be hydrophobic (ie, reject water) - pure tung oil, for example - or it must seal the surface so that water cannot penetrate into the wood.  A good quality poly would meet this requirement if applied in several coats, with the first application thinned for better penetration into the surface of the wood.
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Ed Weber
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Re: Wood coaster finish
Reply #7 - Sep 2nd, 2018 at 3:09pm
 
The reason I suggested the product that I did was because it is easy to apply, reapply and it's tough. Coasters can get scratched up quickly from the bottoms of ceramic cups. Good Stuff and other similar products are made for countertops and workbenches (mine included). Very durable product that doesn't leave a plastic feeling like poly. IMO
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Andrew Abercrombie
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Re: Wood coaster finish
Reply #8 - Sep 2nd, 2018 at 3:12pm
 
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A:) Let's take roll call to see if we're all here.
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A:) Right, let the record show that we are here.
C:) Who?
 
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chris lawrence
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Re: Wood coaster finish
Reply #9 - Sep 2nd, 2018 at 4:54pm
 
What about a cork insert for the center?  Craft supply sells round ones.  You might even be able to take a piece of cork flooring and turn down inserts from that.
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