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<p>Its not the plywood by itself.  Its the part that doesnt have scenery yet.  A fellow club member has a large layout in his basement that had been in progress for 3 years with no issues.  Then 2 winters ago there was a BIG issue.   We had started installing scenery on the layout and had painted some sections.  We noticed when we came back to the layout in January after taking Christmas off that there were kinks in the tracks (many of them).  We noted that these kinks only occured in the areas that scenery had not been started (bare plywood).  It turns out that laytex paint does not seal wood, rather it actually allows moisture to travel through wood.  This caused painted the plywood to expand and contract with air moisture content variations.  Since then we have finished painting all benchwork and there have been no further issues with this layout of this nature.</p> <p>Edit: I think I may have posted here in the forums about this Jan 2014 or so.</p>
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