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Old 03-01-2018, 08:46 PM   #1
ians
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Default How many coats?

I've sealed one section of my baseboards with 5 coats of PVA/water mix. Others I've just started with and only done one so far.

I'm planning (although it may not happen soon) to use foam to cover the sections where track will be as well as for the base for scenic areas. It is a large area to cover 6 x 3ft by 4ft and a 4ft by 7ft section of 3/4inch ply. (There is a little more.) How much of this area really needs sealing? It's in a double garage as part of the house with bedrooms upstairs, house to one side and cavity wall insulation on 2 external walls. The coldest part is the garage door.

I don't think dampness is going to be a problem as the 4x7 section has been stored in the garage for 5yrs and hasn't got dampness in yet.
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Old 03-01-2018, 08:55 PM   #2
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Well think you have well and truly sealed it now.
If you want to you could give it a coat of dirty brown earth colour Emulsion if you want to. Or may be you will do that after the Polystyrene goes on. I dont know what you mean by that I have never used under track myself is this some new way of doing it or am I just getting to old.
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Old 03-01-2018, 09:26 PM   #3
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Don't know if I'm doing it right, just a lot of videos seem to have foam or something under the track.
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Old 03-01-2018, 10:00 PM   #4
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What purpose will the foam have? If it’s to simulate ballast, don’t bother.
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Old 03-01-2018, 11:49 PM   #5
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I'm not sure of the purpose. I assume it's to do that, to raise the track a little.
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Old 04-01-2018, 09:38 AM   #6
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Foam underlay is imho a complete waste of time and money. You will find that most on here will lay track straight on the baseboard to ensure a firm, flat and stable base. However if you want to create a raised shoulder to your ballast then a layer of cork, cut to fit under the track would do - buy packs of cork floor tiles and cut them to size.
And don’t ever be fooled into thinking it will deaden the sound - it won’t.
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Old 04-01-2018, 10:32 AM   #7
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Unibond, mix it with 50% water, apply one coat, put the track straight on the baseboard....
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Old 04-01-2018, 10:32 AM   #8
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Toatally agree. Foam is a waste of time and will cause problems.
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Old 04-01-2018, 10:45 AM   #9
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Now I never use foam underlay after my first experience where it caused serious issues with running reliability and points were always causing stalling and derailments. I now only lay track directly onto the baseboard. Some of the guys at my local MR club use cork in strips just a little wider than the sleepers, but again there is little benefit if you ballast and glue the track in place, unless the whole baseboard is covered in cork which to me seems a waste of money!
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Old 04-01-2018, 11:58 AM   #10
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Thank you all for the advice on the foam underlay - I think the foam is now going to be used for hills etc not as underlay.

The other question in my original post "was how many coats of sealant of PVA/water mix is needed?"
If it has been answered I missed the answer.....
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