First paint job
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Painting in a garage lessens the chance of bugs or dust ending up lodged in your paint while it is still in its curing stage. | Painting in a garage lessens the chance of bugs or dust ending up lodged in your paint while it is still in its curing stage. | ||
| − | One way to turn your garage into a temporary paint booth is to get huge plastic | + | One way to turn your garage into a temporary paint booth is to get huge plastic drop cloths from you local hardware store or home improvement store. They are cheap and effective for protecting your tool boxes and "toys" (Atv's, etc.) from over spray. |
Open up your garage door about 1/8 to a 1/4 way up, this will help with ventilation, since solvents sink to the floor. Place a fan near the opening, facing outside, to help even more with airflow. Opening any side doors and roof vents helps lots too, Place another fan around here. Box fans may work, but at a minimum you should ensure that these fans are the brushless type to reduce the amount of sparking the exhaust stream will "see". Remember, the fewer sparks the paint vapor "sees" the less likely you are to cause an explosion. An even better solution to box fans would be to use squirrel cage blowers, commonly found in HVAC and exhaust vent systems. Try to get the type where the motor is outside of the squirrel cage to reduce heating the exhaust stream. Place the squirrel cage blower motor outside of your "paint booth" and run ducting into (or out of) your paint booth. A good rule of thumb for blower sizing is to try to change the air TWICE every minute. Hence, if you have a 10'x10'x10' paint booth (1000 cubic feet) you want a 2000 cfm blower (2000 cubic feet per minute). | Open up your garage door about 1/8 to a 1/4 way up, this will help with ventilation, since solvents sink to the floor. Place a fan near the opening, facing outside, to help even more with airflow. Opening any side doors and roof vents helps lots too, Place another fan around here. Box fans may work, but at a minimum you should ensure that these fans are the brushless type to reduce the amount of sparking the exhaust stream will "see". Remember, the fewer sparks the paint vapor "sees" the less likely you are to cause an explosion. An even better solution to box fans would be to use squirrel cage blowers, commonly found in HVAC and exhaust vent systems. Try to get the type where the motor is outside of the squirrel cage to reduce heating the exhaust stream. Place the squirrel cage blower motor outside of your "paint booth" and run ducting into (or out of) your paint booth. A good rule of thumb for blower sizing is to try to change the air TWICE every minute. Hence, if you have a 10'x10'x10' paint booth (1000 cubic feet) you want a 2000 cfm blower (2000 cubic feet per minute). | ||
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With any spray gun, you get what you pay for! | With any spray gun, you get what you pay for! | ||
| − | HVLP (High Volume Low Pressure) is the way to go when buying a spray gun although LVLP (Low Volume, Low Pressure) can work acceptably with the right paint. The prices have come down to reasonable levels, and the wasted paint by | + | HVLP (High Volume Low Pressure) is the way to go when buying a spray gun although LVLP (Low Volume, Low Pressure) can work acceptably with the right paint. The prices have come down to reasonable levels, and the wasted paint by over spray (Not to mention the mess) makes a siphon-feed unit a poor choice for the home hobby sprayer. |
Remember that high-solid primers like high-build type 2k urethanes require a larger (1.7mm) tip and setup internally than a regular paint gun. 3-gun sets are available for as little as $100 that include a primer gun with the larger tip, a paint/clear gun, and a 1.0mm tipped touch-up gun. Cutting (wet sanding) and buffing make up for a lot of shortcomings in inexpensive HVLP guns. So determining which is more valuable, your money or your time, is a determining factor in choosing a paint gun. A cheaper gun will require more time spent cutting and buffing than a top-of-the-line gun that lays paint out more evenly, but at an added price of several hundred dollars. A budget gun can be had for under $30, whereas a SATA 3000 digital runs around $650. You decide which is more important. Most folks will spend a little more time cutting and buffing than spend the extra on the fancy gun. The difference can be spent on go-fast goodies! | Remember that high-solid primers like high-build type 2k urethanes require a larger (1.7mm) tip and setup internally than a regular paint gun. 3-gun sets are available for as little as $100 that include a primer gun with the larger tip, a paint/clear gun, and a 1.0mm tipped touch-up gun. Cutting (wet sanding) and buffing make up for a lot of shortcomings in inexpensive HVLP guns. So determining which is more valuable, your money or your time, is a determining factor in choosing a paint gun. A cheaper gun will require more time spent cutting and buffing than a top-of-the-line gun that lays paint out more evenly, but at an added price of several hundred dollars. A budget gun can be had for under $30, whereas a SATA 3000 digital runs around $650. You decide which is more important. Most folks will spend a little more time cutting and buffing than spend the extra on the fancy gun. The difference can be spent on go-fast goodies! | ||
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'''''Metallic paint''''' | '''''Metallic paint''''' | ||
| − | Spraying metallic is a little different then spraying a solid color, they will mottle (have blotches of dark and light areas) and tiger stripe if sprayed incorrectly. The key to spraying metallic paint is to move the "dry spot" around. For example, spray one coat one direction, then the next coat in the direction 90 degrees to the first coat. Overlapping the coats up to 75% is another key to good metallic finishes. Remember anytime that the paint moves the metallic does as well, so if they run you will get the metallic all in one spot. With metallic always use the suggested reducers and mix the entire batch to be sprayed at the same time. I recommend this ANYTIME you paint. DO NOT play mad scientist/chemist. FOLLOW the instructions to the letter. The engineers at the paint companies spend millions on R&D, so they are already sure of the results you will get by mixing the product any given way. You, however, as an | + | Spraying metallic is a little different then spraying a solid color, they will mottle (have blotches of dark and light areas) and tiger stripe if sprayed incorrectly. The key to spraying metallic paint is to move the "dry spot" around. For example, spray one coat one direction, then the next coat in the direction 90 degrees to the first coat. Overlapping the coats up to 75% is another key to good metallic finishes. Remember anytime that the paint moves the metallic does as well, so if they run you will get the metallic all in one spot. With metallic always use the suggested reducers and mix the entire batch to be sprayed at the same time. I recommend this ANYTIME you paint. DO NOT play mad scientist/chemist. FOLLOW the instructions to the letter. The engineers at the paint companies spend millions on R&D, so they are already sure of the results you will get by mixing the product any given way. You, however, as an amateur, are not. Do not re-invent the wheel. |
==Brian Martin's "Moving the Dry Spot" technique== | ==Brian Martin's "Moving the Dry Spot" technique== | ||
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Lacquer has been used for many years in the hobby, and is used in a few restorations where the correct paint type will award/deduct points from a car. HOWEVER, due to V.O.C. requirements, the use of lacquer paints are becoming less and less welcome in most areas, and is actually illegal in most metropolitan areas. It is old technology, and is pretty much a dinosaur of the paint world. | Lacquer has been used for many years in the hobby, and is used in a few restorations where the correct paint type will award/deduct points from a car. HOWEVER, due to V.O.C. requirements, the use of lacquer paints are becoming less and less welcome in most areas, and is actually illegal in most metropolitan areas. It is old technology, and is pretty much a dinosaur of the paint world. | ||
| − | There were and still are many good looking lacquer paint jobs out there. One of the pros is that it dries extremely hard with a quick drying time. THIS IS A FALSE MYTH. Lacquer never fully dries. If you spill gasoline on it, or many under-the-hood chemicals as used in the hobby, you will ruin your lacquer paint. Urethane enamel has replaced lacquer for a very good reason. It is much more durable. AND is more | + | There were and still are many good looking lacquer paint jobs out there. One of the pros is that it dries extremely hard with a quick drying time. THIS IS A FALSE MYTH. Lacquer never fully dries. If you spill gasoline on it, or many under-the-hood chemicals as used in the hobby, you will ruin your lacquer paint. Urethane enamel has replaced lacquer for a very good reason. It is much more durable. AND is more environmentally friendly than lacquer. Waterborne is the next wave of technology to lower painting emissions even further. |
You WILL NEED to sand and buff the whole project to get a smooth, shiny finish. If somebody is helping you spray it, they can know that modern lacquers will basically spray the same as the old lacquers. If you spray lacquer clear; the clear coat, (as long as it is a quality product) will be easier to control. | You WILL NEED to sand and buff the whole project to get a smooth, shiny finish. If somebody is helping you spray it, they can know that modern lacquers will basically spray the same as the old lacquers. If you spray lacquer clear; the clear coat, (as long as it is a quality product) will be easier to control. | ||
You will need at least the same amount of thinner as you do paint to do a lacquer paint job. | You will need at least the same amount of thinner as you do paint to do a lacquer paint job. | ||
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The person at the paint store when you buy your paint will prove to be invaluable when you talk to them and ask questions. | The person at the paint store when you buy your paint will prove to be invaluable when you talk to them and ask questions. | ||
| − | The basic | + | The basic recipe for urethanes (single stage)is this:<br> |
Mix one gallon of color<br> | Mix one gallon of color<br> | ||
One quart of hardener<br> | One quart of hardener<br> | ||
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Spraying: These paints are applied in a two or three coat method, depending on the product. Base coats, for example, are applied in a couple coats or until everything is covered. Clear is applied in three or even four heavier coats to allow for wet sanding and buffing. Single stage is applied in 3 coats normally. | Spraying: These paints are applied in a two or three coat method, depending on the product. Base coats, for example, are applied in a couple coats or until everything is covered. Clear is applied in three or even four heavier coats to allow for wet sanding and buffing. Single stage is applied in 3 coats normally. | ||
| − | HVLP (High Volume Low Pressure) paint guns have become so inexpensive that is is silly to try to paint without one, due to the amount of paint wasted by overspray using an old style | + | HVLP (High Volume Low Pressure) paint guns have become so inexpensive that is is silly to try to paint without one, due to the amount of paint wasted by overspray using an old style siphon-feed gun. |
| − | == How to mix and spray | + | == How to mix and spray Water based paints == |
== Paint Defects and Flaws == | == Paint Defects and Flaws == | ||
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| − | '''Fish Eyes''' Fish eyes are a separation of the paint normally resembling the look of a fish eye. These are areas where the paint will not adhere thus making small craters in the paint. Fish eyes are always caused by contamination. The oil naturally present in your fingers is probably the number one cause of | + | '''Fish Eyes''' Fish eyes are a separation of the paint normally resembling the look of a fish eye. These are areas where the paint will not adhere thus making small craters in the paint. Fish eyes are always caused by contamination. The oil naturally present in your fingers is probably the number one cause of fish eyes. You will see most all good painters and body men wearing latex gloves similar to what doctors wear when prepping a car for paint. Wax, silicones, diesel fuel, and products such as Armor All can all cause the problem. The contamination is usually on the surface being painted but can also result from contaminated paint and contaminated air. Using a wax and grease remover, proper air filters and general cleanliness around the paint area should stop the occurrence of fish eyes. |
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