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Sandblasting prior to painting?

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ryan

03-09-2003 12:23:44




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How do you go about prepping a tractor for paint.
Can you sandblast them, just cover the items you don't want damaged and just let the sand fly? Or are other methods prefered? thanks for the help! ryan Also can you paint over the bare metal or primer first, what is the wait time between primer and paint? thanks again ryan




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David

03-12-2003 13:26:52




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 Re: sandblasting prior to painting? in reply to ryan , 03-09-2003 12:23:44  
I'd disagree a bit (in the nicest possible way) about sandblasting sheet metal. I think it may be a risk if its thin but on the tractor thickness stuff I have done (two bonnets, mudguards, dash panels) I have had no problem. I reckon with my smallish sandblaster 1/8 inch nozzle) it just doesn't heat it up so that you could even notice. Maybe it is more of a problem if it is a big blaster. That said, I think some guys may have reported problems on thin stuff.

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David

03-12-2003 13:24:51




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 Re: sandblasting prior to painting? in reply to ryan , 03-09-2003 12:23:44  
I'd disagree a bit (in the nicest possible way) about sandblasting sheet metal. I think it may be a risk if its thin but on the tractor thickness stuff I have done (two bonnets, mudguards, dash panels) I have had no problem. I reckon with my smallish sandblaster 1/8 inch nozzle) it just doesn't heat it up so that you could even notice. Maybe it is more of a problem if it is a big blaster. That said, I think some guys may have reported problems on thin stuff.

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Tractor dan

03-11-2003 14:48:42




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 Re: sandblasting prior to painting? in reply to ryan , 03-09-2003 12:23:44  
dont sand blast sheet metal unless really nessasary but then just do spots cuz sand blasting causes lots of heat and will worp sheet metal also prime first self etching primer



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Tractor dan

03-11-2003 14:48:24




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 Re: sandblasting prior to painting? in reply to ryan , 03-09-2003 12:23:44  
dont sand blast sheet metal unless really nessasary but then just do spots cuz sand blasting causes lots of heat and will worp sheet metal also prime first self etching primer



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Tractor dan

03-11-2003 14:48:00




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 Re: sandblasting prior to painting? in reply to ryan , 03-09-2003 12:23:44  
dont sand blast sheet metal unless really nessasary but then just do spots cuz sand blasting causes lots of heat and will worp sheet metal also prime first self etching primer



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David

03-09-2003 15:11:16




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 Re: sandblasting prior to painting? in reply to ryan , 03-09-2003 12:23:44  
I did mine recently but only the tinwork which I stripped off the tractor. Next one I do I will blast the lot probably after as much dismantling as I can without leaving holes open. I would take off the wiring loom and gauges as a minimum but I found that rubber is very resistant to sandblasting so hoses and tyres would be ok if you don't direct too much blast at them for too long. Rubber is also good to cover things you want to protect. I was concerned about how much damage it might do but having done it myself am pretty reassured. It was a bit like painting using a 1/4 inch wide spray of grey primer and quite controllable. I think you'd need to dismatle a bit to get to the inaccesible places. I painted the blasted parts straight away (i.e. same day in late afternoon) with a two pack etch primer which was is quite watery and transparent so I just brushed it on as it didn't leave any brush marks. It protected the parts very well until I got round to putting primer on. Wheels have been sitting with it just the etch on since December with no rust forming. Firts time I had sandblasted and its a great way to clean things up if your careful but also a horrible noisy, messy, unhealthy job and very demanding of the air supply too. I have another old post from about December about other things I learnt from my experience with it, if your interested. A search of the archives should pull it out.

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