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What is a spray bomb?

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TByrd

01-28-2006 20:53:15

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I have noticed some threads where people mention using spray bombs, especially when applying primer. They talking rattle cans? Or some other device? An older neighbor and friend who died a few years back mentioned a type of canister where he would fill with piant or other substance, then after attaching the "lid" would pressurize the canister with compressed air, then spray it. Is this the infamous spray bomb? I just painted my JD40 today, my 2nd tractor paint job. It turned out pretty good, but the cast sections are not very shiney. I suspect that my technique, especially the distance between the gun and surface needs some work. I am sure people who turn out fantastic jobs have done it over and over many times. I would not mind that if prep didn't require so much time, gotta love it. I have enjoyed this forum and have picked up some good information.

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Farmallgray

01-29-2006 06:59:45

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Re: What is a spray bomb? in reply to TByrd, 01-28-2006 20:53:15

Those sprayers you pressurize with compressed air usually don't atomize fine enough to do a good paint job. They are made for spraying stuff like WD-40, weed killer and other stuff that you would normally use in a trigger spray bottle.
Aresol can, spray bomb, and rattle can are all the same thing.

As far as your gun painting, how fast you move the gun can affect it too. It sounds like you have the too far away or are moving it too fast.
You aren't getting enough paint on. It is drying slightly before it hits the surface. You could also use a slower reducer. That will allow the paint more time to flow out and gloss up.

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TByrd

01-29-2006 20:32:40

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Re: What is a spray bomb? in reply to Farmallgray, 01-29-2006 06:59:45

FarmallGray, I suspect you are correct on both points of distance between the gun and work piece in addition to the speed. Not having much gun experience, I know that I probably moved the gun too fast on each sweep. There seems to be a fine line between moving slow enough to gain sufficient coverage (per coat) versus applying so much paint in a pass that it sags/runs. As far as the reducer, I used medium Sherwin Williams Hi-Glo for synthetic enamel (65-90 degree). I had my shop warmed up to about 85 degrees overnight so the tractor would warm up for the event. Used JD paint 5:1 to the reducer. Oddly enough, the hood, sitting on saw benches outside turned out super, very shiney, lots more paint. I remember holding the gun closer. Of course the hood had been water sanded slick. I believe that a visit to a junk yard for some body panels would make good practice. Of course, this is a working tractor. I just spent $2300 on a complete rebuild, bore .045, new head, new oil pump gears and shaft. That included resurfacing fees at the machine shop on numerous items as I rebuilt them, such as hyd pump covers, etc. Enough of that on this forum. It runs fantastic and wanted to pretty it up a little. The last time I painted it was 1992 with a Wagner airless sprayer and lots of brushing out the runs, but you know, it turned out looking good. The synthetic enamel, though not a choice of lots of people on this forum, is very forgiving to a novice "painter." I will get better thanks to this forum.

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CNKS

01-29-2006 10:27:46

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Re: What is a spray bomb? in reply to Farmallgray, 01-29-2006 06:59:45

The Preval cans are already pressurized, you just throw away and replace. Only used mine once, so far, as you say paint is not atomized enough, and tends to run. I probably should not have thinned it. It will take some practice to get used to it, and, I may not use it again. I would just as soon use a touchup gun, although the pattern is bigger.

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Farmallgray

01-30-2006 17:17:10

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Re: What is a spray bomb? in reply to CNKS, 01-29-2006 10:27:46

I have only used the preval once also. I didn't like the fact that I couldn't "tune" the air pressure and fluid flow. I suppose if a person used it more they could get accustomed to how it sprays and adjust their technique accordingly.
It seemed like I had to overthin the paint to get it to spray.

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Rod (NH)

01-29-2006 12:31:40

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Re: What is a spray bomb? in reply to CNKS, 01-29-2006 10:27:46

I'm surprised you had a problem with the Preval Sprayer. The few times I've used one it seemed to atomize about the same as a typical rattle can. A light, soft spray to be sure, also like a rattle can, perhaps even softer. I don't think you are supposed to thin specifically for a Preval. Do the same as you would for any standard spray gun. The times I've used one has been with epoxy primer - standard mix - no thinning. They wouldn't be appropriate for surfacer however, at least not without excessive thinning. As I recall the pattern, like most rattle cans, is essentially round instead of oval so that may have something to do with it. Of course typical rattle can paint is quite thin anyway and easy to run unless you apply light coats. The advantage that I see in a Preval unit for small, intermittent jobs (smaller than for a spot gun) is that there is no gun cleaning required. I've used my Preval sucking from a 2 oz paper cup that is thrown away afterwards so there is not even a need to clean any container. I agree that for anyone with a spot gun, they have a limited use but there are times when one is the preferable alternative. Sometimes when I am sanding surfacer over epoxy, I will inadvertently sand through the epoxy to bare metal. A quick spot of epoxy via a Preval is preferable to bothering with a spot gun for only a quarter-sized spot. They also would be good for epoxy-priming small parts quickly after sandblasting if one didn't have a spot gun or didn't want to bother with a spot gun for a single small part.

Rod

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CNKS

01-29-2006 12:40:31

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Re: What is a spray bomb? in reply to Rod (NH), 01-29-2006 12:31:40

The priming of small parts might be a good idea -- I usually do several parts at a time, thus use a touchup or full-size gun. Again, I haven't used it enough to be dangerous. You have a point about sanding thru to bare metal. Just takes practice, I haven't had much use for it yet. It does have it's applications, just not for me, so far.

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CNKS

01-29-2006 06:55:38

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Re: What is a spray bomb? in reply to TByrd, 01-28-2006 20:53:15

A spray bomb is a rattle can. Preval makes a pressurized canister that you put your own paint in. Useful for correct match on touch ups. Many paint defects don't show on cast because of it's rough texture. It is difficult to get an exact 50% overlap on cast. Also difficult not to make a double pass on some areas just to make sure they are covered. If you make a second pass before the paint flashes (10-15 minutes with quality paint), you get what is called "dieback", that is it appears faded.

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1030 brian

01-28-2006 21:20:20

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Re: What is a spray bomb? in reply to TByrd, 01-28-2006 20:53:15

Most of the time a "spray bomb" is an aerasol can of paint.

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