Question: I inadvertently left my model locked in my closed van all afternoon in the hot desert sun? Will this have any effect on the POLYCOTE ECS covering?

Answer: Nothing permanent but you will likely have some sagging at least the first and second time you do this. At the risk of sounding facetious... cooking your model in your vehicle for hours on end is generally not a good idea! Temperatures can easily exceed 50C (122 F) under such conditions and if your model is stuck in this environment with no circulation for hours and hours, sagging is often the result.

We recommend avoiding this type of problem. Keep the model out of situations where the temperature is extreme with little or no circulation.

If it has occurred, there is no point in crying over spilt milk...  if you see sagging, don't panic! BEFORE you do anything at all, please review the Tip on Tightening Sags in POLYCOTE ECS.  Sagging is fixable (a whole model can be done in less than an hour) but only if you go about it properly. If you jump into this with your heat iron and heat gun assuming you know how to do this because you've fixed Monokote sags and bubbles for years, you have a high probabilty of making a botch of this and you will be stuck with a rather unpleasant result.