~ One man’s opinion / observations ~
I’ve only ever seen/heard of vinyl losing its colour or cracking, even when the plasticizers leach out they evaporate they I don’t think they become ‘sticky’ and remain on the surface.
When UV light is absorbed, it starts to break (cleave) weak chemical bonds, which leads to bleaching (fading), discoloration, chalking, brittleness and cracking - all indications of UV deterioration.
Thus, it is important to provide UV protection with agents that use competitive absorption to convert the light wave energy into harmless heat (like carbon black does in tyres) Untreated rubber, vinyl, and other plastics readily absorb and are degraded by UV light
I'd be real interested to know what is causing this 'sticky' residue?
~Hope this helps ~
Knowledge unshared is experience wasted
justadumbarchitect / so I question everything/ Jon