To intimidate spiders or invite them? It is perhaps questionable whether they see colors the same as we do (maybe yellow is a warm and inviting color to them)
Too bad there isn't a "shoo 'roo" for spiders 😜
I have heard that it's possible to pull a vacuum through MDF. I'll have to double-check but I think that's what Shaper Origin folks are talking about on the Shaper Tools forum for vacuum holding. I've been skeptical on that fact because I want to evaluate just how much holding power you can achieve by trying to vacuum through a flat porous material that is guaranteed to stay rigid for years (unlike neoprene which you reminded me also has the nuisance factor of degrading to the elements even when left to its down devices.