I think my wysteria is dealing with it, but I don't know if she just started or what, but her head won't come off. I pulled a pony new from box and she was fairly sticky (to be expected) I don't think plasticizer causes others to leak, that only appears to be the case if you have a bad climate. Don't keep them too close together because they can stain. I personally have separated ponies with such issues away from my herd, just because. (even though I don't mind the after math of the leakage)