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Hi guys,

Is necessary to degrease the surface after blasting before painting ? ........or is enough just cleaning with air copressed ?



Thanks for your answer.
 

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You should always remove any visible contaminates such as grease and oils before any blasting operations is performed.
 

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Glen
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No doubt that is the best medicine but it depends on the customer and the job. If you are blasting on a bridge for $60,000 and then placing a $30,000 coating on it, it's a no brainer. The reality for small retail jobs like a car frame is you just can't get what you want even just to blast it half the time so you probably won't want to spend an hour with a pressure washer and money on cleaning agent and if you even have a place to do it especially if it's winter. For low price work you just blast it and move on. Fact is I have blasted hundreds of the greasiest rears, axels frames and the like and either I or the customer have painted them with epoxy or just Rustolium and I have never in all the years been told of a paint failure of any kind. This would be with mostly repeat customers so I would know if there were any issues. Always consider the best methods first but you have to earn a living too and you have to price your work right to do that.
 

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I always advise my customers to degreace there parts before they bring them to. I let them know my service will be a little cheaper and will give them a better finish. Its on them, unless like example given about. I would bid it in.
 

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I'll just be sure to never bring you anything oily to blast Glenn. Lol. I'm picky and stick to the standards of the industry.
But some people want a cheap job. If it is explained what should be done and they chose to do otherwise then its there problem. Cant make a customer do what you know is right.
 

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Until you get blamed for a problem that could have been ad voided. Customers always wants a cheap job, but that's no excuse to lower the quality of your work. When that customer gets a cheap job, they are really asking for a top quality job done cheap in their thinking.
 

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Glen
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Yeah I'm sure all the guys in here get out a wash bucket and a brush and sit there and scrub all the grease off every rear or the whole under side of a car and they do it for free because it's more important to do it right than to actually earn a living. Let's be honest here. I'm not a detail shop I'm a blaster. If you want a washing you came to the wrong place. As it happens it is not permitted to power wash grease in to the parking lot out side of my shop. I of course do not have a fork lift and a dedicated legal wash bay and almost no one in here does. It isn't realistic and I would like to see a show of hands from everyone who not only pulls there blast rig but also brings a pressure washer with them and takes three hours in prep. That would be no one. It isn't just Glen you know. I happen to provide a very good service with in the means my customers have to offer. The day I get to work on a nuclear power plant with a $170,000 budget, I guess I'll be able to ramp up my standards too. Just sayin.
 

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Ha ha Glen. :) We all know now that all of us don't wash the projects. Sometimes ( most times) I'm out on Moblie jobs and dragging a water tank and psi wash is not fezzable. I tell they customer to clean off as much as they can before I get there, If they don't, I explain that I might be blasting an area of grease around a few times till it's gone. Most stuff I do is equipment, dump truck stuff, that's going back into service in a crapy environment and will back to be redone at some point any way. Salt and calcium will eat off the paint before failure due to grease. Lol On cars, I tell the customer that they need to degrease if they want a good paint job. And after I'm done blasting I tell them again to wash it and clean again. After that it's on them. My guarantee is that I guarantee that I'll get the paint and rust off.
 
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