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MS-75 Regular Location: Adelaide Registered: June 2002	Re: What power air compressor for home spray job? Fri, 22 April 2005 15:38 BEWARE-ESSAY APPROACHING........ Yeah-as someone mentioned before in the thread (and I was also told many moons ago) that a 12-14 CFM (Cubic Foot per Minute) compressor was the go. A min flow ability of 12-14 CFM seems to be the accepted rate required to keep most air tools/spray guns running contiuously without needing the air compressor running 100% of the time. Once you have the comressor running 100% of the time it means that the comressor unit itself cannot supply enough air at the required pressure to run the tool/gun at the pressure for which it is designed. Examples- 1. If you are running a die grinder almost constantly whilst doing a port job, or a spray gun for a re-spray, and the compressor unit is turning on only occasionally for just a short time, it means this: The compressor you are using is of a good size and only has to run for a short time every few minutes to replenish the compressed air (potential energy) that you have used up to drive the tool/spray gun. 2. If you are running a die grinder almost constantly whilst doing a port job, or a spray gun for a re-spray, and the compressor unit is turning on shortly after you start and stays on the whole time you are using the tool-whilst the speed of the tool/paint delivery rate and spray pattern of the gun slowly decreases/degrades, it means this: The air flowrate at the required (tool) pressure of the compressor you are using is too low. However, The shaft speed , (ie. diegrinder-airdrill-airgrinder-rattlegun etc RPM), or the flowrate(paint gun, blovac, air bower etc), of the tool you are using will not drop to zero if the driving air compressor is running 100% of the time. (providing of course the compressor is capable of flowing a least a bit of air-ie a fish tank compressor is no good-derr ) However, as the (small and shitty Chinese/Gook Machinery Company-GMC) compressor, when running flat-out (100% of the time), is only capable of delivering say 2/3 the volume of air at the required pressure, or say the required volume at only 2/3 pressure, needed by the tool, then if the tool is run 100% of the time, and the compressor is on 100% of the time, then the tool speed/flow will fall to probably only 2/3 of what it would have been running with a compressor either of required minimum or larger size. Having said all this-of course there are realistic ways around having to buy a $$$ 12+ CFM compressor. 1. Buy two (90-110 bucks each) 6-6.5 CFM GMC ones and hook them up in parallell (pressure is the same-but flow is 2X) - that will give you 12-13 CFM for 1/4-1/5 the price of a Clisby and 1/10th the $$ for an Atlas Copco brand one, etc. 2. Learn to live with a smaller CFM compressor unit by- 2A Fitting a supplementary reservoir (old LPG tanks are good) so that once it has filled the bigger reservoir it takes longer for it to empty and trigger the comp again. (you are also waiting longer for it to fill back up though) 2B Being careful with your spray nozzles when painting so that when you are blowing on the coat, you are blowing on with a pretty small paint orifice/nozzle. This means you are not using big flow rates, but rather small rates at the normal pressure so the small compressor can keep up. It does mean that you take longer to spray a given area, but that you get proper atomisation and a smooth finish. (albeit with more coats) Case in point for patience, common sense and being stingy- I have a story on a 290HP L28 240Z Datsun in an old Street machine with an AWESOME midnight blue paintjob that was applied using a tiny Beaver spray gun............ It took him longer than with a big 14 CFM compressor, but as a pretty inexperienced painter, had he used a (high flowing) professional spray gun he would have ended up with runs galore. Anyway dude-thats my essay on the subject (prettymuch everything I know the subject really). In closing though, as for acryllic and 2-pak, my advice (generally taken from a few sprayer friends I have) is Acryllic all the way. Reasons- 1. 2Pak has cyanide compounds (as mentioned before-isocyanates(sp?))VERY VERY BAD when airbourne, and looks the best the day it's done-awesome for show cars that are garaged all the time-but degrades over time. 2. Acryllic is easier to spray on, is not a 2-part system, requires a buff once done to shine it right up, but once you get the clearcoat (also accryllic will do there) and buff it up only a pro can really tell-and the more you polish the acryllic the shinier it gets-even 10 years later. Sorry for the essay-but thats it from me-I know nothing else about paint! Sean [Report message to a moderator]

	Subject	Poster	Date
	What power air compressor for home spray job?	Doylie	Thu, 21 April 2005 06:56
	Re: What power air compressor for home spray job?	81LOWLUX	Thu, 21 April 2005 06:58
	Re: What power air compressor for home spray job?	CrUZsida	Thu, 21 April 2005 07:01
	Re: What power air compressor for home spray job?	81LOWLUX	Thu, 21 April 2005 07:02
	Re: What power air compressor for home spray job?	drift86levin	Thu, 21 April 2005 07:04
	Re: What power air compressor for home spray job?	81LOWLUX	Thu, 21 April 2005 07:06
	Re: What power air compressor for home spray job?	Grega	Thu, 21 April 2005 07:08
	Re: What power air compressor for home spray job?	Doylie	Thu, 21 April 2005 07:58
	Re: What power air compressor for home spray job?	ChuckLandwehr	Thu, 21 April 2005 10:57
	Re: What power air compressor for home spray job?	feral4mr2	Thu, 21 April 2005 11:29
	Re: What power air compressor for home spray job?	clubagreenie	Thu, 21 April 2005 12:32
	Re: What power air compressor for home spray job?	toof	Fri, 22 April 2005 08:35
	Re: What power air compressor for home spray job?	clubagreenie	Fri, 22 April 2005 09:45
	Re: What power air compressor for home spray job?	SL666	Fri, 22 April 2005 10:07
	Re: What power air compressor for home spray job?	toof	Fri, 22 April 2005 10:09
	Re: What power air compressor for home spray job?	SL666	Fri, 22 April 2005 10:19
	Re: What power air compressor for home spray job?	Viper_III	Fri, 22 April 2005 10:24
	Re: What power air compressor for home spray job?	takai	Fri, 22 April 2005 10:50
	Re: What power air compressor for home spray job?	81LOWLUX	Fri, 22 April 2005 23:52
	Re: What power air compressor for home spray job?	SL666	Fri, 22 April 2005 12:48
	Re: What power air compressor for home spray job?	takai	Fri, 22 April 2005 12:51
	Re: What power air compressor for home spray job?	clubagreenie	Fri, 22 April 2005 12:52
	Re: What power air compressor for home spray job?	le_angel	Tue, 26 April 2005 06:38
	Re: What power air compressor for home spray job?	Viper_III	Fri, 22 April 2005 12:57
	Re: What power air compressor for home spray job?	bored	Fri, 22 April 2005 13:11
	Re: What power air compressor for home spray job?	Viper_III	Fri, 22 April 2005 13:39
	Re: What power air compressor for home spray job?	manmx83	Fri, 22 April 2005 14:43
	Re: What power air compressor for home spray job?	Ta22lover	Fri, 22 April 2005 14:45
	Re: What power air compressor for home spray job?	MS-75	Fri, 22 April 2005 15:38
	Re: What power air compressor for home spray job?	clubagreenie	Fri, 22 April 2005 23:38
	Re: What power air compressor for home spray job?	boofis	Sat, 23 April 2005 22:56
	Re: What power air compressor for home spray job?	Mookie	Sun, 24 April 2005 07:40

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