posted
Seal it up with a polyurethane wood finish.
There's a brand name of Deft (deft-thane) as well as other, available at home supply stores.
It shoots from a spray can, and is the best way to seal up MDF and woods before painting. It needs to dry for quite a while before being exposed to moisture however.
I don't know how it will hold up under full exposure to the elements however, I've only used MDF in automotive interiors.
The clear polyurethane wood finish does hold up quite well though. My dad built some oak furniture and used the clear on the wood. 10 years of water rings from cold drinks and it still holds up.
------------------ Mike Pipes Digital Illusion Custom Graphics Lake Havasu City, AZ http://www.stickerpimp.com
Posts: 8746 | From: Lake Havasu, AZ USA | Registered: Jun 2000
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posted
MDF (Medex), is made about 30 miles from my shop. When they came out with that stuff, they really touted it as a sign material, and a lot of shops went for it. I don't know of a single incident where it was used outside that didn't end up in disaster. Don't even consider it for exterior use.
Jerry Mathel Jerry Mathel Signs Grants Pass, Oregon signs@grantspass.com
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Posts: 916 | From: Grants Pass, OR USA | Registered: Dec 1998
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posted
You guys need to get ahold of Pat Welter from Masterhand Signs in Unity, Sask. He uses Medex all the time, with great results.
As I understand it, Medex is a type of MDF, but has been impregnated with a resin material that stops the absorbtion of water. It isn't the same as the MDF that you buy at the lumberyard. Pat does great work, and has beautiful medex signs that have been around for years.
I hope he doesn't mind me posting his email address: pr.welter@sk.sympatico.ca
Sue
------------------ "It is never too late to be what you might have been." -George Eliot
Suelynn Sedor Sedor Signs Carnduff, Sk Canada
Posts: 2863 | From: Carnduff, SK Canada | Registered: Nov 1998
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