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OscarVictor
Posts : 39
Join date : 2018-02-13

plywood or mdf

on Thu Feb 22, 2018 8:50 am
Hello Gents, need a bit of advise

I intend to build several generic « boulevard elements » in 20mmm size approx 25x30cms.. with cobbelstome and lots of rubbles /furnitures etc..

I wonder whether you would recommand thin plywood or thin mdf for the bases, bearing in mind that i intend to glue foam and elements with wood glue (and i’m not sure the MDF will be happy with that…)

So ? what would you recommand?

thanks
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Fitz
Posts : 99
Join date : 2018-02-12
Age : 56
Location : Christchurch, New Zealand
http://mojobob.com

Re: plywood or mdf

on Thu Feb 22, 2018 8:56 am
Plywood is not immune to warping when one side is saturated, any more than MDF is. Both materials should be sealed before glues and paints are applied.
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OscarVictor
Posts : 39
Join date : 2018-02-13

Re: plywood or mdf

on Thu Feb 22, 2018 9:05 am
thanks for your answer.. How would you recommand this "sealing"? please
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Fitz
Posts : 99
Join date : 2018-02-12
Age : 56
Location : Christchurch, New Zealand
http://mojobob.com

Re: plywood or mdf

on Thu Feb 22, 2018 10:20 am
I use a spirit-based aerosol primer — Rustoleum — because it's quick and easy. But a brushable acrylic primer works fine too, as long as you do both sides at once so that moisture penetration is equivalent on both sides. The wood needs to be sealed on both sides and all edges to ensure that moisture stays out when you start gluing and painting.

Even so, if you're using a lot of glue or paint in your final landscaping, some warping is possible, as PVA (white glue) and acrylic paints both shrink as they cure. the sealer coat helps to minimize this, as the top glue/paint layers aren't actually attached to the fibres of the wood.


Last edited by Fitz on Thu Feb 22, 2018 10:25 am; edited 1 time in total
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OscarVictor
Posts : 39
Join date : 2018-02-13

Re: plywood or mdf

on Thu Feb 22, 2018 10:23 am
thanks, will defo have a go...
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Re: plywood or mdf

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