Just thought this may be of help, I'm a retired signwriter of 45 years and have been using this paint for a long time so thought I would see how it would match on my van.
I have a 2012 Jayco Poptop and all the plastic fittings on the outside e.g. fridge vents, handles, power cover etc have all gone yellow. I masked them up gave them a very light sand and a clean and sprayed them with this paint. The match is close on perfect and having used it on all sorts of materials it sticks to most anything. If you want to try it I would suggest that you see how it matches on your van in a inconspicous place first. It can be bought in the big green shed for about $12 a can.
I have a 2012 Jayco Poptop and all the plastic fittings on the outside e.g. fridge vents, handles, power cover etc have all gone yellow. I masked them up gave them a very light sand and a clean and sprayed them with this paint. The match is close on perfect and having used it on all sorts of materials it sticks to most anything. If you want to try it I would suggest that you see how it matches on your van in a inconspicous place first. It can be bought in the big green shed for about $12 a can.