That is a great looking spider! 
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I used great stuff on my large pumpkin Sentinel to hide the PVC and painted that to hide that it was great stuff. I do a little touch up paint each year when I pull it out. I haven’t had any problems with degradation but then again mine doesn’t stay out all month so maybe that’s the difference.The spray foam gets brittle and gross after a few years but I don’t know what else to use on props!