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DIY spray painting advice

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element
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PostPosted: 21:44 - 07 Jan 2009    Post subject: DIY spray painting advice Reply with quote

I got a compressor for xmas and I want to learn how to spray/sandblast.. I understand though that sandblasting might be a bit much on a small compressor (I got a 1.5hp/25L)..

also what would I need to spray a frame/parts..

cheers
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Last edited by element on 10:35 - 06 Feb 2009; edited 1 time in total
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SoND
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PostPosted: 23:41 - 07 Jan 2009    Post subject: Reply with quote

That's much too small for sandblasting, my 3hp 200L would struggle.
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stirlinggaz
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PostPosted: 17:12 - 08 Jan 2009    Post subject: Reply with quote

hi,
as previous poster says, a bit small for blasting, but would be ok for spraying panels & the like,
i've resprayed full fairing sets with my little 28l jobby.
just get a decent gun or 2.
i've got a hvlp gravity fed gun, (cost about 40 quid from ebay) & its got a regulator with it.
done a couple of bikes with 2k & they have turned out ok.(definately better than any rattle job i've done)
also worth getting a small gun, airbrush type, for touching up etc.
one of my fave tools, the compressor! (that & the dremel). use it for painting the fence/shed (with the cheap gun i got with it), inflating tyres etc, dust gun is handy & so is the grease gun. also got an impact wrench for it as well.
cheers,
GAZ
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element
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PostPosted: 10:32 - 06 Feb 2009    Post subject: Reply with quote

ok thanks.. any advice on what paint/primer/laquer and where to get it?

cheers Thumbs Up
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SPARES FOR SALE. 2RK TZR // 82 DR125 // DT125R/E .... PM ME...
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sumpgard
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PostPosted: 20:16 - 06 Feb 2009    Post subject: Reply with quote

be very carefull when using 2k paints and primmers these contain very harmfull chemicals you should always use a proper extractor airfed face mask cloves and overalls and make sure you read all the safty imformation that comes with the paint.
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Paddy Blake
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PostPosted: 20:28 - 06 Feb 2009    Post subject: Reply with quote

Here is a good thread for spray painting.
https://www.autobody101.com/forums/about5183.html

Paddy.
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Damon
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PostPosted: 21:11 - 06 Feb 2009    Post subject: Reply with quote

i know its a bit off topic, but what compressor do you have?

Cheers,

Damo
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BanditsHigh
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PostPosted: 10:42 - 07 Feb 2009    Post subject: Reply with quote

Paddy Blake wrote:
Here is a good thread for spray painting.
https://www.autobody101.com/forums/about5183.html

Paddy.


Fantastic ... been wanting a site that gives info on 2k painting Karma

Did a paint job on my GSX1400 ... fecked up on the lacquer coat as it started cracking/peeling after a few months ... with this site I can find out what I did wrong ... was an expensive lesson (£125 a litre for the flip paint)

https://i16.photobucket.com/albums/b9/BanditsHigh/GSX1400/FromBackAndSide.jpg

https://i16.photobucket.com/albums/b9/BanditsHigh/GSX1400/FromBehind.jpg
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tutton
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PostPosted: 22:53 - 07 Feb 2009    Post subject: Reply with quote

BanditsHigh wrote:
Paddy Blake wrote:
Here is a good thread for spray painting.
https://www.autobody101.com/forums/about5183.html

Paddy.


Fantastic ... been wanting a site that gives info on 2k painting Karma

Did a paint job on my GSX1400 ... fecked up on the lacquer coat as it started cracking/peeling after a few months ... with this site I can find out what I did wrong ... was an expensive lesson (£125 a litre for the flip paint)

https://i16.photobucket.com/albums/b9/BanditsHigh/GSX1400/FromBackAndSide.jpg

https://i16.photobucket.com/albums/b9/BanditsHigh/GSX1400/FromBehind.jpg

So what did you do wrong then?
im intreigued.
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BanditsHigh
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PostPosted: 09:56 - 08 Feb 2009    Post subject: Reply with quote

Quote:
So what did you do wrong then?


That's just it ... I don't know Laughing

For a start I used a shitty Earls Spraystation 3000 HVLP system ... name says it all really Embarassed

First things to go wrong ... the primer (2k) sputtered and spat it's way onto the tank, nice if you like textured finishes ... couple of hours to remove that and start again.

Second time not too bad, so smoothed off and put base coat of red (2k) on ... few hours later it was still soft ... so stripped that off and started again.

Tank painted red and then masked up for doing the black graphics (halfords acrylic this time) ... four hours later was ready to spray the flip paint on.

So I get the flip paint mixed up and start spraying. All goes well until I noticed that the black graphics I've done are sliding down the side of the tank and starting to merge with the red ... AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAHHHHH!!!

Decided I'd put it on too thick and the thinners in the 2k melted the acrylic. Stipped back to bare metal again Crying or Very sad Crying or Very sad Crying or Very sad Crying or Very sad Crying or Very sad Crying or Very sad

Primed, red base then black graphics all done again (simplified this time) and ready for the flip paint. Gave it mist coats this time until I'd built up a decent coat and acrylic paint ok this time.

Next was the lacquer ... did two coats with about 20 minutes between them, then left for an hour and did another coat ... I think that's where I went wrong.

A few months after it went on the bike some of the lacquer started to crack and some to peel away from the flip coat ... I think it was to do with uneven shrinkage between the first two coats of lacquer and the final coat.

I've done good paint jobs (i.e. mirror finish) using the Halfords rattle cans but this was the first attempt at 2k ... now have a site I can visit to read up on it before I try again some day, using a proper compressor and gun this time mind you Thumbs Up
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Ichy
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PostPosted: 10:20 - 08 Feb 2009    Post subject: Reply with quote

Was this done indoors or out? What was the temperature like at the time?
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BanditsHigh
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PostPosted: 10:43 - 08 Feb 2009    Post subject: Reply with quote

Quote:
Was this done indoors or out? What was the temperature like at the time?


Indoors ... in my old bedroom believe it or not ... I've got a very understanding mother.

I tented the whole room out in plastic sheeting, leaving a vent to the outside world via the window ... temp was probably about 18-20c.

I put it down to no experience of 2k whatsoever, and a shitty painting system.

I bought an organic filter mask but wasn't 100% happy with it as I could smell the paint as I sprayed, which I didn't think you should ... I'll rig up a +ve feed system to a mask the next time I try it.

The site mentioned above, with a bit of searching should give all the info I need to try it again at some point, but think I'll practice on some old bits and pieces first.

I know that you need to wait between coats for them to flash off, which I believe refers to the solvent evaporating, but how long and how you tell it's ready for another coat is an unknown at the moment.

Would be nice to get a rough guide on BCF for anyone who was contemplating it Thumbs Up
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BanditsHigh
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PostPosted: 10:48 - 08 Feb 2009    Post subject: Reply with quote

Example of rattle can finish .... GSX1400 again ... lasted all of two weeks until a silly bint drove out of a car park right into my LHS!!

https://i16.photobucket.com/albums/b9/BanditsHigh/GSX1400/100_0199_2.jpg

https://i16.photobucket.com/albums/b9/BanditsHigh/GSX1400/PolishedTank.jpg
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tutton
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PostPosted: 14:08 - 08 Feb 2009    Post subject: Reply with quote

BanditsHigh wrote:
Quote:
Was this done indoors or out? What was the temperature like at the time?


Indoors ... in my old bedroom believe it or not ... I've got a very understanding mother.

I tented the whole room out in plastic sheeting, leaving a vent to the outside world via the window ... temp was probably about 18-20c.

I put it down to no experience of 2k whatsoever, and a shitty painting system.

I bought an organic filter mask but wasn't 100% happy with it as I could smell the paint as I sprayed, which I didn't think you should ... I'll rig up a +ve feed system to a mask the next time I try it.

The site mentioned above, with a bit of searching should give all the info I need to try it again at some point, but think I'll practice on some old bits and pieces first.

I know that you need to wait between coats for them to flash off, which I believe refers to the solvent evaporating, but how long and how you tell it's ready for another coat is an unknown at the moment.

Would be nice to get a rough guide on BCF for anyone who was contemplating it Thumbs Up


Your spraygun is one of those poo electrical things, thats your first issue Laughing
Flash off for laquer is usually about 20-40 mins between coats, usually says on the spec sheet or back of the can.

Masks, if you can smell paint theres definantly an issue 2K mainly the primer and laquer contain hardner which is a isocyanate and will give you asthma and other breathing problems. as youve suggested the best way is to get a airfed mask although there looking around 100-150 for one, and your likely going to need another compressor and filter unles you got a huge tank. What mask exactly did you have as there are some 2k masks available from 3m for about 30-40 quid, Remember isocyanates are odourless and colourless so its best to be protected and they can absorb through the skin and eyes.

and those 2nd pics is that a pattern because the 2nd pic looks like fisheyes? im probably wrong on that.
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BanditsHigh
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PostPosted: 17:13 - 08 Feb 2009    Post subject: Reply with quote

Was just a rubber face mask with organic filters screwed on ... that's probably why I've got em.. emfa ... emph ... breathing problems (emphysema) Laughing

That and all the years I've routed MDF, sprayed rattle cans in confined spaces etc!!

I knew that the 2k paints had the nasty stuff in them which is why I went to the expense of the filters, but wasn't 100% sure of them ... you've just made me even more certain they were crap Crying or Very sad

With regards the blue paint job, the entire bike was done like that ... good old fish net tights ... not for me of course Embarassed

After full strip back to bare metal and plastic, all primed then painted black as the secondary colour (i.e. colour you want the lines to be) ... once dry stretch fishnets over everything (yourself included if that way inclined) and spray a few coats of the main colour, in my case a metallic blue BMW paint ... midnight blue or something like that.

Finally, remove fishnets and spray god knows how many coats of lacquer ... due to the different levels of the black and blue you get a rippled finish initially but the lacquer will start filling that in ... then rub back until smooth and polish.

All the best ... Barry

P.S. I went for the subdued look, i.e. you don't see it until you get close, but you can do it with contrasting colours for a more in your face finish.
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loply
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PostPosted: 17:39 - 08 Feb 2009    Post subject: Reply with quote

SoND wrote:
That's much too small for sandblasting, my 3hp 200L would struggle.


That's nonsense.

It depends entirely on how big the part you are sandblasting is.

Besides which, you can sandblast with ANYTHING it just will take longer with a small compressor.

I regularly sandblast bike parts using an unbranded 50L compressor which I guess is 1.5hp or 2hp. I have done fork-bottoms, shock bodies, tons of brackets bolts etc, calipers, loads of stuff.

Even did a rifle stock, which took the longest.

Sandblasting is a great process and can revitalise ancient and badly corroded parts or alternatively is the perfect prepping process for paintjobs on DIY brackets or any random part you are painting, and I would recommend doing it with any sized compressor, just if you find it testing your patience too much you know what you need to do (buy a bigger one!)
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