Best sealant for MDF?

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Best sealant for MDF?

I need to make it waterproof, so whats the best sealant or varnish thats gunna do this? it doesnt have to look nice so a paint could be an option.:smoke:

Yacht varnish. Or even just ronseal waterproof stuff, you can get it from any Homebase/B&Q type place.

What's it for?And do you know there's a water-resistant type?

trogggy wrote

What's it for?And do you know there's a water-resistant type?

Its for vivariums!! there must be some sort of water sealant.Mcsatan so your saying any usual wood sealant will be ok for water proofing it?

Duct tape across his mouth and hide his keyboard

Silly Car wrote

Duct tape across his mouth and hide his keyboard

Bugger! beat me to it

Mancunian Lee wrote

Its for vivariums!! there must be some sort of water sealant.Mcsatan so your saying any usual wood sealant will be ok for water proofing it?

If it's to hold water I would use a layer of plastic inside the mdf. If it's just for splashes etc then you could use yacht varnish etc. A gloss exterior paint (as for a door/window would probably work, as it's designed to do that job. Unless you've already got the mdf I'd look at the water-resistant stuff though, because otherwise if any water gets in it will swell.

Mancunian Lee wrote

Its for vivariums!! there must be some sort of water sealant.Mcsatan so your saying any usual wood sealant will be ok for water proofing it?

It should be, but it depends what sort of beastie you're going to put in there, would glass or perspex be better? Animals tend not to like varnish and paint very much...

Isaac Hunt wrote

Bugger! beat me to it

Double bugger you both beat me to it.

McSatan wrote

It should be, but it depends what sort of beastie you're going to put in there, would glass or perspex be better? Animals tend not to like varnish and paint very much...

Its to protect against reptile piss, they will be glass fronted though. Ive got a couple already built that cost me £100 each, but i need a fair few more so its gunna be cheaper to build them myself. Was gunna use MDF becsause its easy to work with, might try ply but then ill have the same problem.Whats veneer like to use? is it easy to work with and get a nice finish? that would water proof it, wouldnt it?

as mentioned, varnished/painted heated viv's will cause chemical vapours. not nice for reptiles.your best bet would be conti board mate.

Mancunian Lee wrote

Its to protect against reptile piss, they will be glass fronted though. Ive got a couple already built that cost me £100 each, but i need a fair few more so its gunna be cheaper to build them myself. Was gunna use MDF becsause its easy to work with, might try ply but then ill have the same problem.Whats veneer like to use? is it easy to work with and get a nice finish? that would water proof it, wouldnt it?

Dunno, never used veneer on anything. It's rather thin though, I would imagine lizardy feet with claws would make a mess of it in no time. Thinking about it, they'd probably wear through varnish eventually too.

Mancunian Lee wrote

use MDF becsause its easy to work with, might

Don't forget here are health issues on cutting MDF.www.design-technology.org/mdf.htmMDF can be dangerous to use if the correct safety precautions are not taken. MDF contains a substance called urea formaldehyde, which may be released from the material through cutting and sanding. Urea formaldehyde may cause irritation to the eyes and lungs. Proper ventilation is required when using it and facemasks are needed when sanding or cutting MDF with machinery. The dust produced when machining MDF is very dangerous. Masks and goggles should always be worn at all times. Urea formaldehyde is always being slowly released from the surface of MDF. When painting it is good idea to coat the whole of the product in order to seal in the urea formaldehyde. Wax and oil finishes may be used as finishes but they are less effective at sealing in the urea formaldehyde

I know! Laminated chipboard, the kind that is used for kitchen cupboards and so on! Waterproof and tough!

CubicIncubi wrote

as mentioned, varnished/painted heated viv's will cause chemical vapours. not nice for reptiles.your best bet would be conti board mate.

Do you have any ideas what they use? all the vivs i have are either veneered, MDF with some sort of varnish or glass. Glass i havent a clue how to work with plus its not good for keeping the heat in so im gunna go with one of the other two.They are going to house mostly snakes and geckos mostly, one or two lizards as well but this is short term housing for them as well. So these vivs im making could almost be disposable.

Shouldn't you use glass so you can see into it?

What can one use to seal the ends of MDF before painting so you get a smooth finish like the face of the board?

McSatan wrote

I know! Laminated chipboard, the kind that is used for kitchen cupboards and so on! Waterproof and tough!

Thats very expensive though isnt it?Horse i know about the dangers of MDF but ill be cuting and shit outside, isnt that the stuff that caused all the babies to have small arms and shit in the 70's?

Here you go, quick STFW and found thiswww.leopardgecko.co.uk/documents/diy/project1.htm

Cheers ears

horse box vanish should do the trick as a sealent. Sorry can't remember the brand name though.

Mancunian Lee wrote

Thats very expensive though isnt it?Horse i know about the dangers of MDF but ill be cuting and shit outside, isnt that the stuff that caused all the babies to have small arms and shit in the 70's?

i think that might have been thalidomide.

can be used as a waterproof for MDF. tells you in the tin the amouts to mix with water for different jobs. It soaks in well so should be able to cope with being scratched a bit, dont know if the animals will like it.

Calamity Blonde wrote

i think that might have been thalidomide.

i think you're right.inhaling MDF dust gives you lung cancer of some description.

Bonda wood hardener. The best stuff ever for sealing MDF. Put about 3 or 4 coats on in quick succession, it soaks into the MDF making the actual material much stronger and also waterproof. It's actually a real git to cut / sand after treating so apply it to the finished item - it goes like very tough plastic. You can spray it on with a trigger spray gun too. Do NOT get it on your hands - it's impossible to remove once it dries and even a tiny bit takes about 4 days to wear off. http://www.decoratingdirect.co.uk/viewprod/b/BONWH/ 500ml does about 2 square meters.

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