Ok. I’ve never painted a model before and thought it would be relatively straight forward. However, I’ve been disappointed with my first attempt at painting some details on my Walthers ore dock. I’ve decided to paint the railings on the ore dock and nice bright safety yellow. I am using Tamiya Color acrylic paint. The paint isn’t going on well at all. Rather than coating the plastic, it is blotchy and uneven. I end up just pushing it around and it eventually rubs off just from brush strokes. I’ve read posts that some people wash the kits in soapy water before painting. Surely this isn’t necessary!?! Should I invest in a primer of some sort before painting with color acrylics? Please help!