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Forum topic by MrRon posted 03-06-2012 09:16 PM 1334 views 0 times favorited 17 replies Add to Favorites Watch
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MrRon

2829 posts in 1893 days


03-06-2012 09:16 PM

Topic tags/keywords: question

What is the best way to seal MDF, especially the edges to completely eliminate moisture? Shellac, polyurethane, epoxy???


17 replies so far

View zer0bot's profile

zer0bot

9 posts in 1650 days


#1 posted 03-06-2012 09:25 PM

I used watered down wood glue and it worked well.

View Bill Davis's profile

Bill Davis

226 posts in 2574 days


#2 posted 03-06-2012 09:28 PM

I do not believe there is a reasonable way to ‘completely eliminate moisture’. Applied finishes will slow down the absorption/desorbtion of moisture but not eliminate it. Some are better than others and more coats adds to their ability to slow misture transfer.

View NBeener's profile

NBeener

4806 posts in 1823 days


#3 posted 03-06-2012 09:31 PM

Spar varnish ?

-- -- Neil

View Chipy's profile

Chipy

374 posts in 1243 days


#4 posted 03-06-2012 10:10 PM

Paste wax about 4 coats.
.

View DIYaholic's profile

DIYaholic

13499 posts in 1325 days


#5 posted 03-06-2012 10:16 PM

Hermetically seal it in a mayonaisse jar & place it under Funk & Wagnall’s doorstep!

I know the folks over at www.cnczone.com use watered down wood glue, when making their MDF CNC Routers!

-- Randy-- I may not be good...but I am slow! If good things come to those who wait.... Why is procratination a bad thing?

View DS's profile

DS

2131 posts in 1070 days


#6 posted 03-06-2012 10:19 PM

Run it through the edgebander with pvc edgetape. Sealed, quick, easy, cheap.

-- "Hard work is not defined by the difficulty of the task as much as a person's desire to perform it.", DS251

View Fred Hargis's profile

Fred Hargis

1773 posts in 1143 days


#7 posted 03-06-2012 10:28 PM

I don’t believe any finish will completely eliminate moisture, although the thinned glue idea sounds like it has some promise.

-- Our village hasn't lost it's idiot, we sent 'em to Washington.

View DWhitt's profile

DWhitt

12 posts in 2197 days


#8 posted 03-06-2012 10:33 PM

I know applying spackling on the edges will keep the edges from acting like sponges when applying paint.. Not sure about moisture though

View Trapshter's profile

Trapshter

62 posts in 1044 days


#9 posted 03-07-2012 12:03 AM

Use a water proof mdf (exteira) is the trade name .nice stuff .you can leave it outside unfinished .works well

-- Smile and wave boys just smile and wave

View joebloe's profile

joebloe

157 posts in 944 days


#10 posted 03-07-2012 12:17 AM

I use water base poly,at least 3 coats.

View Viktor's profile (online now)

Viktor

447 posts in 2068 days


#11 posted 03-07-2012 12:24 AM

Epoxy, nothing else comes close. It is used in fabrication of wooden water tanks, bathtubs etc. There are kinds that impregnate the substrate and form water tight seal. Ask shipwright on this site or look up his blogs/posts. He is an expert on this and I recall he recommended a particular brand used in marine applications.

Found it: http://lumberjocks.com/topics/22534
see post #18

View kizerpea's profile

kizerpea

746 posts in 1017 days


#12 posted 03-07-2012 05:57 AM

I THINK ITS CALLED MDO…FOR OUT DOOR PROJECTS AN SIGNS…....AS FOR MDF..THROW IT IN THE YARD AN FORGET IT….I DONT EVEN LIKE IT IN MY SHOP

-- IF YOUR NOT MAKING DUST...YOU ARE COLLECTING IT! SOUTH CAROLINA.

View 559dustdesigns's profile

559dustdesigns

632 posts in 1817 days


#13 posted 03-07-2012 06:44 AM

I use Mdf all the time. Use Polyester resin (fiberglass resin), it will seal anything.

-- Aaron - central California "If you haven't got the time to do it right, when will you find the time to do it over?"

View woodluc's profile

woodluc

11 posts in 979 days


#14 posted 03-07-2012 10:11 AM

What is the result you’re trying to acheive.
Is it going to be a table or a piece of painted furniture?
Or is it just a workbench (or similar) that needs a durable finish.

-- http://timberfurnitureplans.com/

View Bill White's profile

Bill White

3446 posts in 2610 days


#15 posted 03-07-2012 03:47 PM

I use Extira too. Heavy, strong, flat. Seal with shellac for a smooth finish.
Bill

-- bill@magraphics.us

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