Paintt not sticking well and sometimes coming out chunky

Posted in Custom Workstation

Hi, I've just started customizing and I've had trouble with the paint sticking on a couple of figures I washed them with warm soapy water and scrub with a tooth brush. Also for some reason I've had a lot of trouble with testors model master warm skin tone being chunky and not sticking is that a problem with the paint or is it something Im doing.