Depending on the size of your model it will have a bit of shrinkage over the years.
One of my customers ordered a 20cm long train (
this one) and noticed that over a year it shrunk by 1mm, but it didn't shrink any further after that,
So I guess with small scale models of just a few centimeters in size, the shrinkage will be a bare minimum and probably not noticeable.
As for the life span, hard to tell.. my oldest model is +- 5 years old, and it's still doing fine
Don't think anyone will be able to really tell what the material will do in 20 years yet
Last edited: Feb 11, 2015