Before You Begin
Dress for success when spray painting. Wear a tight-fitting, organic vapor respirator when spraying solvent-based coatings, indoors or outdoors. The type of protection the respirator is designed to deliver is marked on the filter cartridges. Check the cartridge to see whether a mask is appropriate for the job you plan to do. You can get by with a dust mask when you're spraying water-based coatings outdoors in good ventilation. Always wear minimum protection - splash goggles, gloves, a hat, and clothing that completely covers your skin.
The spray-painting process really has four steps: preparing the siding, preparing the paint, practicing your technique, and, finally, painting the siding, all the while adjusting your technique to fit your sprayer.
Avoid spray-painting when the air temperature is below 45 degrees or above 75 degrees. Don't spray-paint in direct sunlight, either. Too much heat dries the paint too fast, and it won't bond well. If it's too cold, the paint dries too slowly, attracting bugs and dirt, and the gun is more likely to clog.
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Step 1 : Get ready
Wash, repair and sand any areas of the siding so they're clean, dry and ready for paint before you pick up the sprayer. Use drop cloths to protect the ground surrounding the siding and masking tape to protect windows and trim.
When renting an airless sprayer, ask for a reversible, self-cleaning tip, which flips open to clear a clog without having to be removed. Be sure you get the operating instructions and have the counter person run you through the basics of using the equipment before you leave the store.
Make sure that the work area is clear and free of tripping hazards or objects that may snag any of the sprayer hoses. Have a helper on hand who can move ladders and drop cloths and otherwise pave the way for you.
Step 2 : Prepare the paint
Always stir paint well and then strain it to prevent clogs in the tip or at any internal filters. Clogging is the number one complaint about spray-painting, but you can prevent nearly all clogs by simply straining the paint first.
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