Framebuilders - DIY bike paint plan/help tips
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03-25-06, 09:16 AM
I decided to try a non toxic acrylic metal primer. I plan on using two coats and fine sanding it. The paint used will be artist grade, pure acyrlic pigment followed by an application of clear coat. I found premixed automotive grade acrylic enamel clear coat. Will a home air compressor and sprayer cut it? My uncle has the spray setup and we have compressors. These arent automotive grade compressors. I am hoping I can pull this off. My goal is to only use highly toxic material in the final clear coat stages. I have rougly 8 ounces of paint, I could get more I plan on mixing it up a bit with small amounts of water.
I don't know why the compressor would be a problem, you might get the spray done before it needs to start up, bikes are pretty small. Main issue is if it shoots water or oil, which you can tell with by blasting air on some paper. You need the right in-line traps if it does. Probably a good idea, no mater what. Make sure it is drained. If it has an inline oiler you may need to replace the downstream hose.
I have no idea how good your gun will be, but given that the guns exist for folks to work on their cars, you may be ok. Test spray.
If you are shooting isocyanates, the best advice is probaly "don't".
03-26-06, 10:30 AM
I've painted a number of frames using PPG Deltron paint (similar to Dupont Imron). I use DP epoxy primer as the under coat and base/clear for the color. The primer and base coat are not particularly toxic; a regular $35 paint resperator is adequate. The clear is fairly toxic though from what I've learned. I use the same mask and increase the ventilation in the garage when spraying. After I spray the coat I get out of the area and wait for the spray to settle a few minuets before going back in. This is not an ideal situation but considering I only do it a couple of times a year I'm not too worried.
Just my opinion.
04-12-06, 09:54 AM
What effect does fine sanding or wet sanding primer and subsequent paint layers have on the final finish of the bike?
Thanks for the help.
Usually positive. Called colour sanding and it normally will level any irrgularity in the surface and provide a good tooth for subsequent coats. One issue is to make sure you can give your whole bike an even treatment. Which probably isn't possible so you need to plan your paint schem with the different surfaces and transitions in mind.
I'm certainly interested if there are high gloss products with low toxicity. So far haven't heard it, so my education may be incomplete. The dangerous problem appears to be that many people assume this is normal product one can finese, while it can cause permanent damage with one bad decision. That could also be old thinking. It's always possible for one person to have the physical resiliance or the fortunate convergence of circumstances to avaoid a dangerous exposure. The question is whether that means the practices they used were safe. Perhaps the safe part is some part of the formula we don't know about.
The other issue is how much does it take to be safe. I have a friend who sprayed this stuff for a boatyard. All they had to do was use air supplied by a branch in the compresor line. Would that be enough? I don't think it is a recognized system since the compressor air is contaminated, but on a risk assessment level it's a whole lot safer than risking a single use exposure that causes lifetime ashma, or death.
Personally I can't see the point for bikes. Touching up a 60 foot catamaran is a big job, repairing a bike, is a nothing. I sure depend on my lungs a lot more than the average person why would I risk them just to have a coating on my bikes that is the equal of the best industry can produce. Sounds like a bad trade.
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