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We always put a note in our kit instructions and receipt to not put the products in the direct sun or expose to heat over 100 degrees. We placed a variety of resin parts on the roof of an old car in the back lot to be exposed to the hot Fresno sun. In mid summer with several days over 105 in the shade, these parts laid in direct sun on that hot car roof. They must have been exposed to over 123 degrees for over a month. We figured that they would warp like a banana. The result was no warping at all. Not even on the thin flat parts. They did change to a yellow color. We are going to leave them out there until winter to see what the long term exposure will be. The resin might break down or who knows what. We use our own blend of very high quality machineable resin and want to see what would happen to the parts for back yard layouts. I just wanted to share this interesting test with you all. <br />Happy Railroading, Keith…The Research Department <br />http://www.pinecanyonscalemodels.com
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