Question for cabinet builders: UV backed plywood? - Woodworking Talk - Woodworkers Forum
 
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post #1 of 5 Old 04-13-2016, 06:57 AM Thread Starter
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Question for cabinet builders: UV backed plywood?

Hey guys, I would like some feedback from any cabinet builders on here. when it comes to building kitchen, and bathroom cabinets (ect) how many of you guys use UV backed plywood? I had a customer ask to have his cabinets built with a light color on the insides, and a darker stain on the outsides.

Although I have never used UV backed plywood, it is my understanding that if you get the traditional UV plywood (that is one side birch and the other side UV) all you have to do on the UV side is spray it with lacquer or poly only. Is this true?

Will it give a nice smooth light colored finish on the inside of the cabinets? Does it need to be sanded with say 320g, then shot some pre cat lacquer or water based poly and be done with it? Any helpful advice on how to properly use and finish UV backed ply would be greatly appreciated!
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post #2 of 5 Old 04-13-2016, 07:10 AM
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The UV backed plywood is just prefinished plywood. It's a good finish they use but I wouldn't like it because it would make the cabinet more time consuming to build. It's would be like building a melamine cabinet, you would need to dado any place where a joint would be in order to be able to glue it. You could use epoxy without running the dado's but it wouldn't be near as strong of a cabinet using raw wood and wood glue. Another issue is if you put solid wood faces on the cabinets. You would have to stain and finish the exterior which would mean you would have to mask off the already finished shelving inside. I prefer to make everything raw wood and when it comes to finishing spray the finish inside and out at the same time.
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post #3 of 5 Old 04-13-2016, 07:37 AM Thread Starter
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Quote:
Originally Posted by Steve Neul View Post
The UV backed plywood is just prefinished plywood. It's a good finish they use but I wouldn't like it because it would make the cabinet more time consuming to build. It's would be like building a melamine cabinet, you would need to dado any place where a joint would be in order to be able to glue it. You could use epoxy without running the dado's but it wouldn't be near as strong of a cabinet using raw wood and wood glue. Another issue is if you put solid wood faces on the cabinets. You would have to stain and finish the exterior which would mean you would have to mask off the already finished shelving inside. I prefer to make everything raw wood and when it comes to finishing spray the finish inside and out at the same time.
I always build my face frames out of hardwood, with dado's in the stiles for the cabinet sides, and dado's in the sides for any shelves.

Is there any reason that I can't do the dado's like I normally would? Also, I like to cut and dado everything first, get it up to the point of assembly, and do the painting/staining and clear coating on the individual pieces, so I don't for see any issues with masking anything off.

With that being said, assuming I go with UV backed ply, does the UV part need to be sanded? If so, is 320g ideal? Would it be ideal to sand and shoot some lacquer or WB poly on it? Or is the UV side already sanded and finished with a clear coat of some sorts?

Steve, I appreciate your feed back on this, and I understand why you don't do this, but the limitations that you outlined are not a problem for me with the way I do things. Am I missing something else?
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post #4 of 5 Old 04-13-2016, 08:06 AM
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Originally Posted by Danny870 View Post
I always build my face frames out of hardwood, with dado's in the stiles for the cabinet sides, and dado's in the sides for any shelves.

Is there any reason that I can't do the dado's like I normally would? Also, I like to cut and dado everything first, get it up to the point of assembly, and do the painting/staining and clear coating on the individual pieces, so I don't for see any issues with masking anything off.

With that being said, assuming I go with UV backed ply, does the UV part need to be sanded? If so, is 320g ideal? Would it be ideal to sand and shoot some lacquer or WB poly on it? Or is the UV side already sanded and finished with a clear coat of some sorts?

Steve, I appreciate your feed back on this, and I understand why you don't do this, but the limitations that you outlined are not a problem for me with the way I do things. Am I missing something else?
Running dado's in faceframes is one thing but to dado all your sides for the shelves is another. If this is the way you usually build cabinets then it should work for you. You will just have to be careful not to scratch the finish machining the parts. Before you get into it find out what finish they use on the sheets. The only one I used was finished with an epoxy coating not suited to be topcoated with lacquer. I can't remember if the sheet had a peal coat on it or someone removed it but I remember having to mask the inside of the cabinet to spray the faceframe. The finishing work on the UV backed plywood should be done when you buy the sheet.
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post #5 of 5 Old 04-13-2016, 08:53 AM
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Danny 870 UV ply is finished and ready to go don't need to sand it if you're going to use it you can build your box the same way you normally do and pre-furnish your face frame before you put it on then the only thing you have to furnish is the finished end. I use maple plywood I do not stain the inside of my cabinets I leave the backs off the cabinets so when I spray the cabinets I don't get any blowback and spray the back separately if I read your post right you dado all your shelves I would think about going to adjustable shelves it would make finishing easier also your client would like it better I also think it's less work in the long run
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