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Old 25-12-2014, 07:52   #16
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Re: Teak veneer over MDF?

I don't know if you could get this to work over a suitable structural substrate. The problem is always that the bond layer in a waterproof laminate may eventually grow black mold & self-destruct. If your bulkheads are not structural than you have more options.

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By the way, ours are up to 2" thick mahogany plywood with very select veneer. 1984 build. Areas that never get wet are great. A leak in a deck fitting can wreck it fast.
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Old 25-12-2014, 08:24   #17
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Re: Teak veneer over MDF?

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Originally Posted by Terra Nova View Post
On the slim chance that you are actually serious...
My guess is that he is serious so your response is ill advised at best. It shouldn't be necessary to insult someone for asking a question or being a bit naive. Forums are supposed to be for sharing information.

The best advice of course is not to use MDF on a boat. Marine plywood would be an acceptable choice. OSB is another poor choice.
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Old 25-12-2014, 08:28   #18
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Re: Teak veneer over MDF?

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Originally Posted by HopCar View Post
There is a board similar to MDF, that the sign making industry uses, that is waterproof.
I think it is only available in 1/2" thickness but I may be wrong about that. If you're interested, check with a sign maker to find the name of it (damn CRS) and where to get it.
MDO (Medium Density Overlay)
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Old 25-12-2014, 08:34   #19
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Re: Teak veneer over MDF?

There is an OSB called nova deck I think, the adhesive used in it is impervious to water, years ago I put a piece of it in a 5 gl bucket full of water and in several days it hadn't changed at all.
Theory is Plywood is superior to solid wood in that is is dimensionally more stable, wood warps more than ply, same theory in OSB, but I couldn't bring myself to put it in a boat either
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Old 25-12-2014, 08:40   #20
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Re: Teak veneer over MDF?

OSB is mostly used as underlayment for roofing and flooring, mostly because it's cheaper than plywood and can be made from smaller, fast growth trees. It is protected from water and moisture in these applications but when a roof leaks over time, the OSB will often have to be replaced from moisture damage.

The savings might add up when building a house but it would be false economy to use anything but the best on a boat.
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Old 25-12-2014, 09:03   #21
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Re: Teak veneer over MDF?

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Originally Posted by rwidman View Post
My guess is that he is serious so your response is ill advised at best. It shouldn't be necessary to insult someone for asking a question or being a bit naive...
Your guess was that he was serious. My guess was that it was equally likely that this was some kind of joke, for anyone to choose TWO such incongruous materials to use on a boat.
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Old 25-12-2014, 09:20   #22
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Re: Teak veneer over MDF?

JUST SAY NO to MDF or OSB. Never use those for a permanent installation in a marine environment. EVER. Don't believe ANYONE if they tell you these will work on a boat.

MDO was mentioned - that is what you want to use. You can get it in 3/8" thick panels but it isn't easy. I just purchased what I need for decking my old wooden boat. 1/2" will go on the deck and 3/8" will go on the house top. 2 layers each. Unsure what will go over it. I may use a wood alternative to teak. I may use a PVC teak. I want to use cork.

Make sure ANY TIME you install ANY plywood in your boat that you seal the edges where you saw. We will be sealing every surface of the panels with CPES - minimum 3 coats. The overlay is a great gluing surface and also takes paint very well.
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Old 25-12-2014, 09:23   #23
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Re: Teak veneer over MDF?

FWIW, I am currently replacing the MDF ( I think the D stands for Damned) the PO used. The fun part is where the MDF was glued well so you get to chisel/sand the crap off the glass. I also live in Houston. MDF has a lifespan in the humidity in the garage of about two years. In an environmnet where you could get condensation it drops off fast. I am using 1/4 inch teak ply , Saturating the ply side with Boric acid to prevent mold, drying and then cutting and placing it. Solves most of the problems in fewer steps.
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Old 25-12-2014, 10:45   #24
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Re: Teak veneer over MDF?

Hi, I'm In the final stages of refurbishing my Nor 'Star Flicka "Desert Star". In order to make the cabin walls thicker to accommodate New New Found Metals port lights I epoxy glued 1/4 inch teak veneered exterior plywood to the wall and varnished it for protection because the teak finish is so thin.
A 4x8 sheet cost me $44.00 three years ago from Houston Hardwoods Inc. www.houstonhardwoods.com The freight was another $55.00 however.
Hope that this is of some help.


Quote:
Originally Posted by Liunatic View Post
So the previous owner rebedded the hatch that leaked in the V-berth, but didn't address the water that had already gotten in. As a result, the teak was all water damaged. We removed the teak-veneered panels, and of course found black mold had eaten away all the backer boards, etc.

So we are down to fiberglass, going to replace the backer with Starboard (most likely), and now are ABOUT to apply peel-and-stick (3M product) teak veneer to 3/16 MDF to fabricate the panels.

We bought the materials from a local wood shop that's been around for 60 years, talked with the owner, and he didn't see a problem with the MDF for interior marine applications.

As the teak veneer is EXTREMELY expensive, I am doing my own research. Sure enough, I turn up everything from, just stick it on and go; Sand the MDF to give it some tooth before applying veneer; varnish the MDF before applying veneer; Do not use MDF ever, anywhere on a boat.

Does anyone out there have any REAL, ACTUAL experience with MDF used in this type of application? And if so, what was your experience.

We did soak a piece of the MDF in a cup of water overnight. Yes, it did swell a bit (maybe 1/16 of an inch) but it did not disintegrate, and dried out quickly. Our thinking is, if that MDF gets that wet for that long on the boat, we have bigger issues to worry about!
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Old 25-12-2014, 10:52   #25
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Re: Teak veneer over MDF?

Hi, I'm In the final stages of refurbishing my Nor 'Star Flicka "Desert Star". In order to make the cabin walls thicker to accommodate New New Found Metals port lights I epoxy glued 1/4 inch teak veneered exterior plywood to the wall and varnished it for protection because the teak finish is so thin.
A 4x8 sheet cost me $44.00 three years ago from Houston Hardwoods Inc. www.houstonhardwoods.com The freight was another $55.00 however.
Hope that this Ii s of some help.
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Old 25-12-2014, 12:06   #26
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Re: Teak veneer over MDF?

One of the nice things about 3M products, is that you can call their 800-number, which should be on the label, and they will always find you a real engineer or product specialist who can tell you exactly how 3M has and hasn't seen the product work. If they know that it is a moisture and mold resistant adhesive, they'll tell you. If they don't know, they'll tell you that too. Straight technical information from the folks who tend to really know their product best.


And if there's a "prep" or "catalyst" that you can use on the MDF to make a better bond? They'd know about that too.
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Old 25-12-2014, 12:11   #27
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Re: Teak veneer over MDF?

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Originally Posted by Delancey View Post
MDF is an excellent material for use on boats as a material for mock-ups and making templates.

That's about it.



I dunno, I use the hell out of it for mold making.
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Old 25-12-2014, 12:12   #28
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Re: Teak veneer over MDF?

The OP should seriously consider Coosa board. Organic materials are so last century.
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Old 25-12-2014, 12:36   #29
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Re: Teak veneer over MDF?

Coosa board ain't green - much of it comes from crude oil. MDO is made of Douglas Fir. An eminently sustainable forest product.

Besides, it is much more expensive than MDO - I ain't rich enough to go that way.
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Old 25-12-2014, 13:50   #30
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Re: Teak veneer over MDF?

Up here in the Pacific north-west we call that mds stuff "cookie board", guess why.
Actually, I have seen mds used in a marine application, for marine toilet seats of all things!
Don't use it , other than for making patterns as suggested, it will turn to "cookie crumbs" and all your hard work and the money you put in will be wasted!
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