OzVMX Forum
Clubroom => Tech Talk => Topic started by: Mark Austin on November 22, 2008, 08:14:21 pm
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Hi lads,
Does anyone have any experience in removing powdercoating from a frame?
The bike has been sitting in a shed not far from the sea for 10 years and rust had begun to form under the powdercoating, so it has to be removed and either repainted or re powdercoated.
Does anyone have any suggesions as to the best approach?
Cheers,
Mark
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That should be Powdercoating...
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sand blasting
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Commercial bead blaster 8) or wire wheel on the old angle grinder :P.
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i reckon you will stuggle with beadblasting. my sand blaster says that it takes more effort than paint just with sand blasting and thats a big industrial set up.
a good paint stripper will work, but pretty slowly. by the time a wire wheel gets even close to getting it all off you will have worn out a wheel or 2. ive tryed removing powder coating on shocks and the amount of pressure and effort you need from the wire wheel it just stuffs it up an wears it out too quick so i used a combination of beadbkasting and paint stripper on those small parts. sandblasting will be the quickest and cheapest method.
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Sandblasting young Oswald
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What's a fram?
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I have a sandblaster guy that I use regularly, mostly for paint only.
When I gave him a frame with powdercoat on it to sandblast, he said it would not be worth it as it would be too rough.
From the look of the frame, the rust has got under the powdercoat and lifted it up, so it may not be a major issue to get it off with a chisel-like tool.
Guess I may have to get into it myself before getting sending it to the sandblaster. Care to have a go at painting it with two-pack when I've finished stripping it Mr Magoo?
Mark
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Anyone used this? http://www.choppersurplus.com/global/articles/howtoremovepowdercoating.html (http://www.choppersurplus.com/global/articles/howtoremovepowdercoating.html)
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Maybe get it acid dipped :-\ jimson
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This is why I never powdercoat anything. I had a Maico frame done years ago and didn't like the colour. I tried to remove it but discovered just how hard the shit is and in frustration ended selling the frame with powdercoat still intact. I now only use cheap rattle cans for frame paint and it turns out brilliant and is easily removed or touched up.
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Actually in almost all cases, you can heat it up ( the coaters curing oven works for this) and scrape off more than enough to easily blast. Never had a big problem with it myself, except that it didn't hold up to chipping as well as wanted.
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i agree 100% with firko. And you dont have to live near the beach for it to be a problem. one small nick in power coating that goes un noticed and as soon a a bit of moisture hits the bare metal, it then rapidly creeps under the whole powder coating. seen it many times. with the paint i use at worst you will get a chip that will go back to the etch primer but not back to bare metal.
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I was told by a powdercoater that the best way to remove it was to burn it off. Sandblasting takes too long.
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yeah you can do that too.
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some powder coaters do use an under coat
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yes some. its still a bit of a cheap and nasty finish in my opinion.
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Mark
Mr Clean Blast and Coat at Gow Street Padtow. Not the lowest cost provider around but they are reliable and fast.
We had a couple of frams done recently .One of the frams was particularly rough and it actually looked great when finished with new podercoat. To easy.
Same price as removing standard paint finish.
MHO ,providing the initial preparation is correct, poder coat is much better than two pack in this application , particularly on a road bike.
I will email the contact details Monday
Shoey
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Mark, I do powder coating so I can atest to the following,
To remove it go to someone that does heat cleaning that is a commerical furnace and have it stripped (I use a guy in Brisbane and costs about 40-50 bucks per frame, it will then need sandblasting to bring the metal back clean.
As for the powder coating v painting powder coat is the same as paint with out the solvent it is that simple it is that it goes on three times thicker than paint that makes it hard to remove, It will only start to lift if chipped if not cured correctly (baked) in the first place and it is always best to pre-treat as with any base metal, zinc plating is a good start as it etchs the frame and the powder with stick better. If using an undercoat a zinc primer is the best.
I have a couple of frames done and have had trouble with it just because I used the wrong primer and applied to thick (was still learning then). I have done hubs and rims with it and on one of my red devils has done 2 seasons racing with no lifting (sticks realy well to bead blasted aluminium). I have also done a couple of half litre speedway sprinter frames and have had no problem (have on one with a clear metalic and still looks good).
The main problem is colour match as most powder suppliers will not do small runs (not without costing the earth) but I am looking it that.
We would do a standard frame and parts for around 70-80 bucks if supplied clean (just to give you an idea of cost).
P.M me if you need more info.
Shane
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Hi Shane,
Thanks for the info Shane.
I haven't got the bike apart yet, but its obvious that rust has got under a lot of the powdercoat and is showing up through the silver powdercoat. Its been sitting for over 10 years and is in very good, original condition, other than the rust.
Its a Laverda, so the frame probably weighs a ton.
Where would I find someone in Sydney to do the heat cleaning - I haven't heard of that before. What kind of company would do it?
Cheers,
Mark
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mr clean at gow st are good reliable and pleasant.a manufacturer friend gets lots done there. cheers .
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Hi Auscobul ...
I've had powdercoating removed from frames. Sand blasters don't seem to happy to do it, so I get them acid dipped. They drop it in a caustic bath for a few hours and it removes the powdercoating. I then give the frame a quick once over with the bead blaster. You can then paint, powdercoat or whatever, and it'll look a treat.
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Yes , I can only happely back that up . It works a treat
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Mark, As wally said if you see a local powder coater they will know as most use a company like I said to clean their hooks and alike of powder buildup.
Acid dipping would be ok but as long as all the acid is cleaned out of the inside of frame as if not could cause rusting from inside out, again it is personal choice and availability.
Good luck with the project mate.
Shane
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Mr Clean
Vanessa Hong 9790-4758 (Manager)
Unit 3 / 89 Gow Street , Padstow
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Hi lads,
Does anyone have any experience in removing powdercoating from a frame?
I do now - fire in the shed.
Rob
sense of humour returning. Enjoying having the time to participate!
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Hi lads,
Does anyone have any experience in removing powdercoating from a frame?
I do now - fire in the shed.
Rob
sense of humour returning. Enjoying having the time to participate!
;D ;D ;D ;D ;D ;D
And if your swingarm pivot bolt is stuck solid don't risk damaging the frame in a press, simply put it in a shed fire which will easily remove that pesky alloy swingarm from the pivot bolt.
;D ;D
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wasnt just english
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i just got my frame sandblasted and powdercoated and was told to get it zinc coated first before coating so that water etc doesnt get under the powdercoating, it was just a two pack zinc but apparently they use the same stuff to coat bridges so it must be good and it only cost $30 to get it done, well worth it. it cost me about $190 to get it zinced and blasted and he said it would be three times the price to get the powdercoating off, so i am glad i am happy with it