Try painters tape and a few thin coats to build the paint up slowly.
Also use complete pieces for each line, otherwise it could break apart and drag through the wet paint when it's being taken off.
When you remove the tape exaggerate the motion (lifting as high as you can without snapping it) and lift it away from yourself.
This will keep the tape from dragging through the paint and if any spatters off the tape it will do it away from your project and yourself.
Do a couple of test pieces first to get a feel for how long to wait before removing the tape.
You want to get it just as the paint tacks.
Too soon and it can run, wait too long and you can pull some of the paint off with it.
Scuff the surface and make sure it's free of oils and grit.
Ethyl alcohol is good for this.
Isopropyl will work but some types leave a film.
Start spraying before the piece and finish after the piece using broad, even strokes.
One tip to get a rattle can to flow like an air gun is to turn the can upside down about an hour before using it (propellants and solvents can settle so this redistributes it throughout the can) and drop the can in water that is warm - hot NOT hot - scalding for 5-7 minutes.
Just make sure you warp a towel around the can as paper labels and folds in the cans construction can trap water.
When liquids warm up they expand (hence why you have to be careful with the water temp) and the molecular bonds stretch, this means they will flow faster and a little thinner.
Also use complete pieces for each line, otherwise it could break apart and drag through the wet paint when it's being taken off.
When you remove the tape exaggerate the motion (lifting as high as you can without snapping it) and lift it away from yourself.
This will keep the tape from dragging through the paint and if any spatters off the tape it will do it away from your project and yourself.
Do a couple of test pieces first to get a feel for how long to wait before removing the tape.
You want to get it just as the paint tacks.
Too soon and it can run, wait too long and you can pull some of the paint off with it.
Scuff the surface and make sure it's free of oils and grit.
Ethyl alcohol is good for this.
Isopropyl will work but some types leave a film.
Start spraying before the piece and finish after the piece using broad, even strokes.
One tip to get a rattle can to flow like an air gun is to turn the can upside down about an hour before using it (propellants and solvents can settle so this redistributes it throughout the can) and drop the can in water that is warm - hot NOT hot - scalding for 5-7 minutes.
Just make sure you warp a towel around the can as paper labels and folds in the cans construction can trap water.
When liquids warm up they expand (hence why you have to be careful with the water temp) and the molecular bonds stretch, this means they will flow faster and a little thinner.
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