last time i sprayed it was quite a few years ago through a G5 so would imagine they have improved it, the only issue i had was getting it through the pipes but that may have been due to inexperience as i'd only been using machine for about a year. it may be better to use a lubricant in the pipes such as mixed wall paper paste or just put water in the pipes as normal then a few good glugs of washing up liquid or in both ends of hose ..and don't attach spray gun til material runs through, start water off slightly higher as well as it will just jam in the pipes if you start of to stiff, so either use your test pipe or just pump it out the bottom into a tub to set consistency before attaching pipes, some people set material then slightly wet it down again as they send it through.