Weathering/washing plastic treads

I use artists oils mixed with mineral spirits at better than 90/10 mineral spirits.

Alright. That's what I'll do.  Thank you very much.  Now I will have something productive to do while I sit in a motel every night this week.

Okay. I assume you're applying the ratio to acrylics? That should be close, perhaps more alcohol or water.

the thinner,the better---- just put on another coat if the first couple arent enough-- this works for acrilic and enamel-- just let the first coat dry first--i use my wifes hair dryer to speed things up if i am using enamels-- dont tell her-- thanks-- treadwell

Thanks for the advice guys.  The treads look great.