Sealing raw edges of MDF - Router Forums
 
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post #1 of 9 (permalink) Old 10-15-2013, 04:10 PM Thread Starter
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Default Sealing raw edges of MDF

There are a variety of ways. Many already suggested. I would caution any effort to seal with linseed oil or tung oil, however. The MDF will absorb loads of oils and the oil will "scab over" on the surface. That does not mean that the oils that soaked in have truly cured and you may get some weeping that could screw up a painted surface.

You can use something as simple as your wife's hairspray if you are going to paint over it
or a (de-waxed) shellac for a truly tight seal. Just remember to mask off the finished surfaces or any solution you choose can change to makeup of the surface you are not working on.
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post #2 of 9 (permalink) Old 10-15-2013, 05:16 PM
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Welcome to the forum, Ray.

Thanks for the tip.

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post #3 of 9 (permalink) Old 10-15-2013, 05:23 PM
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I have been selling and using MDF for a number of years. I have found by mixing PVA wood glue with water 3:1 and painting it on concentrating on the edges is an excellent sealer. Better than PVA in Australia we have a product called BondCrete and when used mixed 3:1 you will find MDF is easy to sand and get a good clear smooth finish ideal to use before painting. I have an old screw top milk container in my shop ready mixed, all I do is shake it up and pour out into a container to fit my brush. When finished simply pour what is left back into the milk container (a little bit goes a long way). Remember to wash your brush out well in water otherwise it will be glued up. Sometimes I mix 1 part acrylic paint 1 part BondCrete 1 part water, this gives me a wash coat that is easy to see where you have been and easier to paint over. The BondCrete mix is easier to sand than normal PVA. There is also a cross linked PVA glue that I think is similar to BondCrete that may work the same.
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post #4 of 9 (permalink) Old 10-16-2013, 10:50 AM
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I once had to construct a very large mdf wine rack, which had to virtually cover a wall. There were numerous vertical members about 50 mm wide, with their edges facing front. In order to seal these edges (for later painting) before assembly I clamped them firmly together in batches of about 20, with edges up, on the workbench, and using a random orbital sander, sanded them to 400 grit - this made them positively shine, and they were perfectly sealed. I picked up this tip somewhere, and it sure worked for me. Rob
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post #5 of 9 (permalink) Old 10-16-2013, 10:59 AM
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Thanks for the tip Rob
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post #6 of 9 (permalink) Old 10-16-2013, 11:09 AM
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Pickup a sealer from Charles Nell it works on MDF..

Review - Charles Neal's Pre-Color Conditioner - Blotch Contol - YouTube

Finishing Fixes with Charles Neil - YouTube

From the Workshop of Charles Neil DVD's Presented by Woodcraft - YouTube

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post #7 of 9 (permalink) Old 10-16-2013, 04:58 PM
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I've always just used an oil based polyurethane which gives a tough finish and protects well.
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post #8 of 9 (permalink) Old 10-18-2013, 05:08 AM
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Welcome to the forum Ray.
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post #9 of 9 (permalink) Old 10-19-2013, 10:04 AM
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Hello, Ray.

Welcome to the forum. A very smart debut!!!

We, woodworkers are everywhere!!!
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