:) Yep, the guns themselves aren't that expensive but getting a compressor/gun combo or a turbine/gun combo that works well can be.
But they can spray both latex and oil paints... cabinets are a great application for them, I wouldn't try to spray an entire room with them.
IMHO, essential if you want to do any cabinets or furniture though...
Anyway, so the last part we finished -- took us one week from start to finish to do all the painting -- was putting the cabinets back in place and affixing them to the walls and floors. The island was not affixed, and the countertop guys wouldn't install the countertops until it was.
I used 3" redhead sleeve anchors to anchor blocks to the concrete slab below the cabinet, and then screwed the cabinet to the floor. Then I used the same 3" anchors and drilled up into the island legs 2", and then put bolts in crossways that could be tightened sort of like you do with a towel hanger against the cleat on the wall.
Now my friends have the fun of finishing the inside of the boxes (couldn't get the spray gun in there) with brush & roller and white paint, and drilling all the holes for the new hinges, for which I'm making them a jig.
It already looks SO much better than it did before, though, and it maybe cost $500 in materials counting the tools (random orbital sander, shop vac) that they had to buy.
The thing that struck me most about their house -- seeing it for the first time -- was how many CRITICAL things the home inspector missed.
For example, the master bath plumbing stack doesn't actually make it out through the roof.
Not in the inspection report.
The fireplace has wood paneling within 12" of the firebox... not in the inspection report.
There are serious signs of water leaks on all of the kitchen plumbing and one of two bathroom vanities, and the shutoff valves are older gate-style or repurposed exterior plumbing bibs -- again, not in the inspection.
There was previous and current wood destroying insect damage in the kitchen; not in the inspection report. (We pulled all of the cabinets that could be moved out and spread diacetemous earth below them.)