Reddit mentions of Dupli-Color CP199 Clear Adhesion Promoter Primer - 11 oz.

here is the adhesion promoter that i was recommended

https://www.amazon.com/Dupli-Color-CP199-Adhesion-Promoter-Primer/dp/B0007UAXJQ/ref=sr_1_1?ie=UTF8&qid=1474655912&sr=8-1&keywords=adhesion+promoter

and also if you can find the "Krylon Fusion" spray can in the color you are looking for, it is supposed to be the best for plastics

You have to first use an ahesion promoter. Also available on Amazon or at any auto parts store. It's a critical step when painting plastic of any kind. Adhesion promoter followed by primer followed by paint.

The paint you want to use will determine the primer you use. If you're going with a brush-on exterior latex or oil base, use the Zinnser. If you plan on a spray paint (my preferred way to do shutters), go with the 2x (Krylon also makes a good plastic primer), your color coat, then a clear for UV resistance and durability.

To add to the iron powder idea, there are actually metalized paints that are basically iron powder in an acrylic binder that you can brush onto parts and then weather with actual rusting solutions. Might consider spraying the piece first with a clear adhesion promoter. One thing to be aware of is that the rust can continue for aaaages, so once you've got it it to a point where you're happy with the look you may want to put some kind of sealer over the thing to lock it in.

I used SEM Trim Black with great results. I used an adhesion promoter first. 1+ year on the flare looks the same as the day I painted it.

The problem with bed liner is that it's textured - and you have to strip/sand it all of if you end up not liking the textured look. But it's great if you like the look!

I believe those help keep the chair stable. Lightly sand the feet. Clean with alcohol and let dry. Spray with https://www.amazon.com/Dupli-Color-CP199-Adhesion-Promoter-Primer/dp/B0007UAXJQ
Let it dry then paint.

To get paint to stick you have to give it a clean surface to stick to. Otherwise it won't be any better than trying to paint dirt on the ground and expecting it to stay. Even brand new guns are usually dirty from the factory they're made in. To clean the gun simply disassemble it and clean each piece with either soap and water or even running alcohol. Also while doing this you can decide what parts you want to paint and what ones to keep unpainted since you want to go for an accented look. It'll make it look a lot more like a finished product than if you were to spray the whole gun assembled.

After cleaning, I would suggest using an adhesion promoter before applying any color. I did this on a springer shotgun about five years ago and it barely has any scratches or chipped paint on it and I have solely used it in CQB until it finally broke this year. Follow the instructions (multiple light coats) and it will help a lot. Same goes for the primary paint itself. Multiple light coats of the color will stick and look better than a couple heavier coats.

I always use an adhesion promoter for plastic parts like bumpers and trim. Something like this https://www.amazon.com/Dupli-Color-CP199-Adhesion-Promoter-Primer/dp/B0007UAXJQ