Here are some pictures of the pretreat machine so far.
Still in prototype stage for looks, but it works well.
Assembled it with openbuild parts I had lying around.
May need to change the pump I have, not sure tho.
I have a 60psi pump and the spray pattern is dense in the middle and lighter on the edges. Not too bad, but want to have a more perfect spray pattern.
I am waiting for a new nozzle tip to see if that will fix it.
If not, I will try to increase pressure.