The hose on my accuspray turbine Hvlp system is collapsing once it gets hot. Do hoses wear out like this, and can I replace re hose with a standard garden hose, or do I need to buy an accuspray hose? Thanks.

Thermostat needs replacing. The wire spring inside the top hose that keeps the hose from collapsing has eroded away. You'll need a new hose too.

IF the hose is collapsing, there is an issue with an obstruction in the system that is causing the water pump to draw to hard on the contents. The obstruction could be the radiator itself. If you have high mineral content in the water you used, deposits can develop in the radiator passages and obstruct the flow.

How many miles on system. One item that most people never check and it has burned up too many motors to mention is the bottom radiator hose. The hose gets soft with age and it will look normal when you are looking at it, but once the engine is warm and the motor starts running at a faster speed, the volume of water moving through the system creates a suction that collapses the lower radiator hose and the engine gets hot because there is not enough circulation. If you have higher miles or years and haven't changed the upper and lower radiator hose, do so any way.

the filter is clogged up which needs to be cleaned
I don't know if you you have a sand filter or an earth filter system but get it cleaned to operate correctly

A collapsed hose will restrict (or completely block) water flow, causing a overheating condition. Before you do anything else, replace the hose. Some aftermarket hoses are available with a wound steel coil that will prevent a hose from collapsing.

Good time to replace all the hoses and thermostat. If I were you, I'd also flush the cooling system while I was at it. Probably wouldn't be a bad idea to take a look at your serpentine (or "v") belt to.

If your particular vehicle has air bleed ports, be sure to properly bleed all air from the system when refilling with coolant. Usually the bleed ports will at or near the point of attachment of both the upper and lower radiator hoses to the engine block.

Good luck!

Heres a couple of things you can check. Start your car and remove the radiator cap,(before it gets hot mind you) when it reaches norm operating temp, look inside radiator to see if water is circulating. If its not moving, its a bad water pump. Also, youre hoses should never collapse, if they collapse when they get hot maybe you need new hoses? Finally, if those dont work, flush out your radiator. Open the bottom cockpit and use a garden hose and let it flush out the system while the car is running, about 10 mins should do the trick. If the radiator looks clean inside then it doesnt need flushed.

Sounds like the radiator is clogged, have the cooling system flushed, the water pump pumps water into the engine and it comes out the top hose to return to the radiator to circulate through it to cool, if the radiator is clogged the water pressure will build on the top hose, also look at the bottom radiator hose, if it collapses when you rev the engine the radiator is clogged, although sometimes the bottom hoses are reinforced with wire to prevent them from collapsing so just because they do not collapse it does not mean the radiator is not clogged.

You shouldn't have to control air flow - just adjust fluid to provide a good spray pattern. If you feel you need to slow down application rate you can buy a garden hose shut-off valve at your local hardware store that will thread onto your air line just before the quick disconnect at the gun.
They look like this

sounds like you have the pressure set to high. also use a nozzle with a smaller orifice. shellac is pertty thin and you are getting to much

I would almost garuntee you have a bad water pump. When water pumps get old there turbines can wear off and even though they may still be there they want be as efficient. When this occurs you can normally rev the vehicles r.p.m. to about 2000 rpm and the heat will start working.