Editing First paint job
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==Cheapo paint job== | ==Cheapo paint job== | ||
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==General tips, tricks, and techniques== | ==General tips, tricks, and techniques== | ||
− | + | See [[Body and exterior tips]]. | |
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− | *A 12" aluminum ruler works great for ratios example: 4:1:1 = 4" :1" :1". Stir your paint with it and wipe it off so you can reuse it later, you can find them everywhere for $1 | + | *A 12" aluminum ruler works great for ratios example: 4:1:1 = 4" :1" :1". Stir your paint with it and wipe it off so you can reuse it later, you can find them everywhere for $1 |
− | *Save your old reducer gallon cans and quart size | + | *Save your old reducer gallon cans and quart size hardner cans. With a pair of tin snips, cut the tops off (at the bead), and use them for mixing paint with a ruler -- but run some tape around the edge so you don't cut yourself. |
*When opening a can of paint, punch a few holes in the trough where the lid sits with a hammer and nail. That way, excess paint will drain out of the trough and into the can, rather than splattering when placing the lid back on the can. | *When opening a can of paint, punch a few holes in the trough where the lid sits with a hammer and nail. That way, excess paint will drain out of the trough and into the can, rather than splattering when placing the lid back on the can. | ||
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*Buy a set of inexpensive spatulas to use as scrapers for paint cans. | *Buy a set of inexpensive spatulas to use as scrapers for paint cans. | ||
− | *To preserve hardener, displace the air in the can with inert gas, such as the shield gas (CO2/argon, etc.) from a MIG welder. Or, use a commercial inert gas finish preservative such as [http://www.bloxygen.com/ Bloxygen]. | + | *To preserve hardener, displace the air in the can with inert gas, such as the shield gas (CO2/argon, etc.) from a MIG welder (DO NOT USE OXYGEN OR ACETYLENE FROM A GAS WELDING UNIT). Or, use a commercial inert gas finish preservative such as [http://www.bloxygen.com/ Bloxygen]. |
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*For easier pouring, affix a 2-inch piece of masking tape to the edge of a large gallon of paint. Pour the paint over the piece of tape. | *For easier pouring, affix a 2-inch piece of masking tape to the edge of a large gallon of paint. Pour the paint over the piece of tape. | ||
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*Leftover paint with hardener can be placed in the refrigerator. The cold temperature will slow down the hardener. You can even throw you spray gun in there if you find you need some supplies, and you are in the middle of painting. | *Leftover paint with hardener can be placed in the refrigerator. The cold temperature will slow down the hardener. You can even throw you spray gun in there if you find you need some supplies, and you are in the middle of painting. | ||
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==Temperature== | ==Temperature== | ||
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See: [[Building a paint booth]]. | See: [[Building a paint booth]]. | ||
− | + | 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. | |
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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. One way to turn your garage into a temporary paint booth is to buy large plastic drop cloths from you local hardware or home improvement store. They are a cheap and effective way to protect your tool boxes and "toys" from overspray | + | One way to turn your garage into a temporary paint booth is to buy large plastic drop cloths from you local hardware or home improvement store. They are a cheap and effective way to protect your tool boxes and "toys" from overspray. 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 and placing additional fans will help ventilation. 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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− | 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. | + | |
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+ | Something that will help keep dust and bugs from coming into your garage is to buy a furnace filter the same size as the window (or build a frame for the filters to go over your door) that you have open. This will collect the dirt and bugs before they become part of your paint job. | ||
+ | If there are strict rules in your area, something that will help is to place a filter before your fan so that it filters the air as it is leaving your shop. | ||
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==Basic mixing techniques== | ==Basic mixing techniques== | ||
Paint and related finishing products can be mixed in glass measuring cups, medicine cups, soup cans, or shot glasses. However, [http://www.ezmix.com/ E-Z Mix cups] are generally preferred for ease of use. Containers with measurements marked on the side are generally most useful. Paper cups are cautioned against because some may have a wax coating. Similarly, plastic cups or containers (medicine cups, yogurt containers, cleaned bottle caps, etc.) are also cautioned against. There are many different kinds of plastic, some of which are inappropriate for storing certain types of finishing products. | Paint and related finishing products can be mixed in glass measuring cups, medicine cups, soup cans, or shot glasses. However, [http://www.ezmix.com/ E-Z Mix cups] are generally preferred for ease of use. Containers with measurements marked on the side are generally most useful. Paper cups are cautioned against because some may have a wax coating. Similarly, plastic cups or containers (medicine cups, yogurt containers, cleaned bottle caps, etc.) are also cautioned against. There are many different kinds of plastic, some of which are inappropriate for storing certain types of finishing products. | ||
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A respirator or fresh air system should be worn at all times when you are working with paints. Even when mixing your paint and getting ready. | A respirator or fresh air system should be worn at all times when you are working with paints. Even when mixing your paint and getting ready. | ||
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==Spray gun tech== | ==Spray gun tech== | ||
− | With | + | 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 overspray (not to mention the mess) makes a siphon-feed unit a poor choice for the home hobby sprayer. | + | 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 overspray (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 | + | 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! |
==Choosing the right type of paint== | ==Choosing the right type of paint== | ||
− | + | See "How to mix and spray urethane enamels" for a basic primer on the types of paint. | |
− | + | Whatever it is, you can ask other car builders that have done their own paint work, or if you know a painter, ask them. Best of all is to consult with the paint salesperson when you go to buy paint. They are a wealth of information. Utilize them. That's what they are there for. | |
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==Two main types of all automotive paint colors== | ==Two main types of all automotive paint colors== | ||
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===Metallic paint=== | ===Metallic paint=== | ||
− | Spraying metallic is a little different then spraying a solid color; they | + | 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 [http://www.hotrodders.com/forum/tip-day-30-a-74674.html 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. |
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[[Category:Body and exterior]] | [[Category:Body and exterior]] |