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cave weta
17th July 2012, 23:39
Ive searched this forum and no one has made mention of it yet

I have a 18 cu/ft compressor and a sandblasting gun that will blast rust and paint off small parts
but I have never experimented with other media like salt, sugar, soda, glass beads....


My project is a GB500 motor that is now 25 years old and the clear coating is yellowed and flaking
all over. should I resort to paint stripper and waterblaster or is there a media that will remove the varnish
yet not destroy the shiny alloy underneath?

Paul in NZ
18th July 2012, 07:40
I'd try chemical first.....

bogan
18th July 2012, 10:11
Look into soda blasting, for some reason I think it is the best blasting option, not sure why though!

F5 Dave
18th July 2012, 12:04
Because any sand or reused media will cause corrosion double quick time. Does anyone do Vapour or soda blasting in NZ?

CookMySock
18th July 2012, 12:06
Bogan is right. Avoid chemical.

cs363
18th July 2012, 12:11
Does anyone do Vapour or soda blasting in NZ?

Yeah, there's shitloads of people doing it: http://www.google.co.nz/search?q=sodablast&rls=com.microsoft:en-GB&ie=UTF-8&oe=UTF-8&startIndex=&startPage=1&redir_esc=&ei=tP4FUI_nAuaQiAez7eSrCA#q=sodablast&hl=en&rls=com.microsoft:en-GB&prmd=imvns&source=lnt&tbs=ctr:countryNZ&cr=countryNZ&sa=X&ei=tP4FUMCPEs2aiQf-z4yiCA&ved=0CFMQpwUoAQ&bav=on.2,or.r_gc.r_pw.r_qf.,cf.osb&fp=5ff86d01d33e196d&biw=1680&bih=935

Had some stuff done by one of the local guys (to me), quite impressed with the finish.

(Edit: Wasn't taking clear coat off though, just to clarify!)

Laava
18th July 2012, 12:32
Paint stripper is the shit for getting the old clear coat off. Then youy need to wash it with soapy water to make sure there are no remnants. Are you going to re-clear coat? This is where it will get tricky. You will have to have a uniform finish, ie light blasting or a linished finish. I assume you are going to dismantle the motor? There are few options when it comes to clear coat, it is not like paint and you should speak to a pro who has experience with it.

unstuck
18th July 2012, 16:37
Try running some baking soda through your sand blasting gun, maybe try a smaller ceramic tip in the gun, presuming its a quality gun that takes ceramics.:headbang:

carburator
18th July 2012, 20:29
Soda blasting is interesting, Ive had two cars stripped this way
sure the media get's into every corner and even hard packs itself
in places but for total paint removal its better than chemical

i also use soda in a cabinet as well, for parts recovery its great
as i work in restoration of stuff.. only thing is you need a very good
water trap on your system else the gun and media turns to mush..

266583

cave weta
18th July 2012, 21:01
Soda blasting is interesting, Ive had two cars stripped this way
sure the media get's into every corner and even hard packs itself
in places but for total paint removal its better than chemical

i also use soda in a cabinet as well, for parts recovery its great
as i work in restoration of stuff.. only thing is you need a very good
water trap on your system else the gun and media turns to mush..

266583

Brilliant Carby! thanks. where do I get the soda from and what size bags are they?

carburator
18th July 2012, 21:36
that might have been glass bead but still thats a 50 year old part ( ok crap photo )
back to brand new as if its just been cast..

25kg bags normally and i only throw a bakebean can into the cabinet
( suction recycle unit ) problem with uber light media to much and it
clogs so better to run a small amount till it loses its abrasive then throw
in another can..

think its AH stock size syntech in auckland is good to deal with..

pete-blen
21st July 2012, 13:00
I have just striped a Montesa Cota frame/arm with a wire
cup brush on a 115mm disc grinder... took about 3 or 4 hours..
got 99% of the paint off..was a few little areas around
brackets I had to dry sand...
Use a twirl knot cup brush , stronger