My late dad used one of those hvlp sprayers from home depot and a gallon of regular enamel, other than the runs it looked good from a 1/4 mile away and it was cheap...🤣
I'm no expert but I don't run the compressor till I am almost done filling, then I run the compressor on and off several times to slowly get stuff circulating...
I suggest you document bearing size and location, ie, upper/lower main caps and the same with rods, these are select fit, meaning probably not the same size in every location... Very important when going back together.
Most all real holsets are boost controlled, the 40 is set around 20psi, so the assembly rod has to be adjusted, it's easy to get it close on a bench with a air hose and regulator, then fine tune it in the truck.
The boost pressure way won't move the arm like a spring does, that's why holsets...
Well I'm betting your spring is too strong or not strong enough... Home made isn't always better.
Keep running those numbers at a easy cruise and you will have more problems... I'd spend a few dollars and buy a turbo master with the correct spring and the correct geometry to start with... Or...
@n8in8or , what air pressure are you using? Are you using sand?
My needs are a bit different, I only use 100-120 grit brown aluminum oxide media @ 35 psi on aluminum parts and 45 psi on iron...
I have to strip any painted or coated parts to prevent contamination first.
The best way to look at the added cost to make certain mods vs the cost of said mods is, how long would you like to keep the truck, is the body, frame, etc worth keeping to you. If you hope to go to a newer truck down the road you may feel just keeping it running is all you need... Some of us...