I was looking for technical info on painting my favorite PVC, Celtec. I am producing some signs to be used outside, so I called Celtec. They told me about a product they recommend..Sherwin Williams paint for vinyl siding. OK, so I call Sherwin Williams and sure enuff in their Super Paint line they use a special formula so that vinyl siding can be painted and with darker colors. I purchased some for my project and am very pleased so far with the application to Celtec, (which, by the way, does not require priming). This paint covers very well and really sticks to the PVC. Nice finish.
What is interesting is this. I wondered it you could paint acrylic with it. So, while I was painting yesterday, with a roller, I painted a piece of clear acrylic. Today, I checked it and it was a beautiful finish. Textured by the knap of the roller and excellant adherance to the acrylic. I also tried it on a piece of Rowmark ADA applique..worked there too. It's water based, unlike spray stuff like Krylon etc. Not real expensive either..around $25-30 a gallon. If you try it, be sure you tell them the vinyl siding formula otherwise they will just give you the regular stuff. It says it has a 25 year warranty too. I haven't read the warranty, but it is so stated on the label.