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I have built buildings out of cardboard in the past and I was happy enough with the results. However I urge a note of caution if your railway is in a garage or shed where the air will be damp. Over time, cardboard, if unprotected, may absorb water from the atmosphere and split. This can happen along the cut edges and on the inside of models where your paint won't reach.

I solved this problem by spraying the finished model, inside and out, with artist's fixative. This is a light colourless varnish that is designed to be used to fix water colour paints. You can buy it from hobbyshops.

My model of Richmond Station in Yorkshire is still intact after 30 years.

Colombo
 
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