Naturally, you want to begin by purchasing high-quality aerosol paints. The best aerosols use a higher-quality paint, cover more quickly, and often feature a fan spray nozzle. "You get what you pay for" holds true for aerosols, too. Generally speaking, stick with the more expensive paints sporting brand names you know and trust. These will cost you anywhere from $5 to $10 per can, but are well worth the investment.
There is usually a reason why the $1 to $2 cans are so inexpensive. They tend to be thinner paints that run very easily, and thus do not cover very well. You'll most likely need additional coats to obtain the same coverage as you would obtain from one pass of a more expensive, high-end brand. In the long run, inexpensive brands translate into significantly more effort with a similar expense as you would have incurred had you begun with the better aerosol in the first place. Even then, you probably will not achieve the same caliber of results.
Please keep in mind we are not condemning all inexpensive aerosol paints, but it has been our experience that a general statement may be made about them. It is recommended that you keep in mind the results you are striving to achieve. The better the result you expect, the greater your investment is likely to be. Of course, be sure to read and follow all manufacturer label instructions and precautions.
The importance of proper preparation cannot be overemphasized. This is the step most likely to be overlooked, yet it is critical to the quality of the end result. Following most label instructions involves one or more of the following cleaning steps:
Painting Over An Existing Coating
Painting Over Surface Rust
Be sure you are working in a well-ventilated area.
It's generally best to apply aerosols at a room temperature of between 65-95°F. The optimum humidity level is below 50%. Painting in higher humidity can cause the paint to "blush", a condition caused when moisture in the air condenses on the paint as the paint is drying.
>Shake the aerosol can thoroughly. Usually, one to two minutes of vigorous shaking is required to get the contents mixed well enough for applying. You'll know the paint is ready when the mixing ball inside the can begins to easily rattle while you are shaking the can.
Test spray. Should the can's spray nozzle be clogged, do not attempt to unclog it with a needle. This will likely cause damage to the nozzle, and ruin the spray action. Instead, carefully remove the nozzle from the aerosol can, and soak it in solvent. Lacquer thinners and acetone typically make for good solvents. This will restore the spray head to its original condition. Replace nozzle using a twisting motion to avoid damage to the sealing O-ring.
Pro Tip: Save old aerosol nozzles so that you have a selection from which to choose should you ever need a replacement.
Always have your work set at a height convenient for you. When spray painting, hanging everything from a clothesline works well and will make it easier to for you to attain complete coverage of every side of your workpiece.
Mask off any areas not to be coated. of course, including surrounding cars or items in the garage.
Hold your aerosol can in an upright position whenever possible. Be sure the nozzle is facing the object to be painted, not your face. Depress the nozzle only with the tip of your index finger. Using any other part of the finger may put it in the way of the spray, affecting the spray's pattern. You should also maintain a proper distance between the aerosol can's nozzle and the object being coated. This distance normally is 8" to 12".
Spray any recessed areas first. The use of delicate, short bursts often helps.
When coating the rest of the part, keep the nozzle parallel to the surface, using long, steady, even strokes. Keep the can equidistant from the part throughout the process. Don't arc your stroke. Instead, move your entire arm from the shoulder.
Overlap coats to assure even color density. Overlap each pass by approximately 50% of the total width of the spray. In other words, with each pass, you are covering new surface with 50% of the width of the spray, and the other half of the spray is re-coating what the previous stroke painted. Do your best to not stop your stroke while in the middle of the part. Keep a wet edge by beginning the job at one edge of the part. Spray horizontally to the other side. Begin at the top of the piece and with each pass of the spray, work toward the bottom of the piece.
Invert the aerosol can, and spray it in a safe direction (into a trash can, for example) until there is no more paint spraying from the can, just air. This action serves to clean the nozzle of any paint residue which would dry and potentially clog the nozzle.
For maximum shelf life, store all aerosol cans right side up in a warm, dry area. An environment with a temperature of anywhere from 55-85°F is ideal.
Caution! If water-based aerosol products are allowed to freeze, they may be ruined.
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