Soda blasting and paint problem

[Philip P.]

Has anyone had a problem with paint adhering after something was soda blasted. On My Claasic Car this weekend the person for Dustless blasting mentioned that paint companies will not warranty paint if an item has been soda blasted. I could not really find anything definate on this issue.
Phil

[Dick W.]

Re: Soda blasting and paint problem

Soda can create problems if the surface is not treated properly after blasting. Normal prep prior to painting is all we have done after soda blasting, with no problems. Remember preparation is the key to any paint job. The paint is the easy part.

[Paul J.]

Re: Soda blasting and paint problem

Has anyone had a problem with paint adhering after something was soda blasted. On My Claasic Car this weekend the person for Dustless blasting mentioned that paint companies will not warranty paint if an item has been soda blasted. I could not really find anything definate on this issue.
Phil

I saw that too. I doubt that it's correct. He might have said that because soda blasting leaves no "tooth" on metal bodies.

Paul

[Russ S.]

Re: Soda blasting and paint problem

I haven't had any problems on the vettes that I have had soda blasted.

[Chris S.]

Re: Soda blasting and paint problem

not a problem.....

[Philip P.]

Re: Soda blasting and paint problem

What they said was that the paint is acid and the soda is base making the bond a problem. That is something I had never heard of.
Phil

[Dick W.]

Re: Soda blasting and paint problem

What they said was that the paint is acid and the soda is base making the bond a problem. That is something I had never heard of.
Phil

See post #2

[Philip P.]

Re: Soda blasting and paint problem

Dick ......any truth to what they said, is there chemical problem. They implied the paint companies would not warrant any car that was soda blasted no matter what was done afterward, just did not make any sense to me.
Phil

[Dick W.]

Re: Soda blasting and paint problem

Never heard that from any paint rep. To me, it is basically does not matter what you strip the car with, just make sure the surface is clean and dust free. If it is metal I am old fashioned and still use Metal Prep to wash the bare metal. I like epoxy primer and a modern primer surfacer such as PPG K36. The will work under any topcoat. Clean & dust free!

[Robert K.]

Re: Soda blasting and paint problem

Southern Polyuretheranes includes a warning with their products about soda blasting recommending a "special treatment" prior to application. I've never soda blasted, so I didn't pay attention to what the special treatment is (it may be just a thorough cleaning as Dick said). In case you've never heard of them, they make excellent primers at great prices that the Hot Rod guys really like.

[Philip P.]

Re: Soda blasting and paint problem

I talked with a body shop owner the other day and I asked about the soda problem, He said he had some problem with the procedure the paint supplier recommended in perparing the surface after it had been soda blasted . It was a lot of work and with the paint rep's help they cleaned the car. It does appear to be a problem and it is may not be a matter of just cleaning and sanding. He said he would not paint another car that had been soda blasted. That is just one opinion but it is something to be aware of.
Phil

[Paul J.]

Re: Soda blasting and paint problem

I talked with a body shop owner the other day and I asked about the soda problem, He said he had some problem with the procedure the paint supplier recommended in perparing the surface after it had been soda blasted . It was a lot of work and with the paint rep's help they cleaned the car. It does appear to be a problem and it is may not be a matter of just cleaning and sanding. He said he would not paint another car that had been soda blasted. That is just one opinion but it is something to be aware of.
Phil

I don't doubt what you're saying, Phil, but it just doesn't make sense. Even if there is a chemical reaction, removal of the soda residue would eliminate any problems, real or perceived. The answer to this question lies in what soda would do in a paint mix. I can't see the possiblity of any reaction with solvent based paints. Maybe this has to do with water based and water borne products. Of course, some residue would have to be present.

Paul

[Dick W.]

Re: Soda blasting and paint problem

I talked with a body shop owner the other day and I asked about the soda problem, He said he had some problem with the procedure the paint supplier recommended in perparing the surface after it had been soda blasted . It was a lot of work and with the paint rep's help they cleaned the car. It does appear to be a problem and it is may not be a matter of just cleaning and sanding. He said he would not paint another car that had been soda blasted. That is just one opinion but it is something to be aware of.
Phil

I would probably expect the treatment was an acid etch, which we used to do to bare metal before the advent of self etching primers. With that said, we never quit using metal prep (etch) even when using etching primers. We had rather err on the side of spending a couple or so extra hours in prep than have problems later on.

[Paul J.]

Re: Soda blasting and paint problem

I would probably expect the treatment was an acid etch, which we used to do to bare metal before the advent of self etching primers. With that said, we never quit using metal prep (etch) even when using etching primers. We had rather err on the side of spending a couple or so extra hours in prep than have problems later on.

Yep, bases and acids. If you don't clean the soda off it would neutralize any acid. Back to your original comment about a clean surface.

[Dick W.]

Re: Soda blasting and paint problem

Yep, bases and acids. If you don't clean the soda off it would neutralize any acid. Back to your original comment about a clean surface.

Iffen it ain't clean nothing ain't gonna stick ta it. Have a feeling the body shop or the paint manufacturer was a lookin' fer a scapegoat. The philosophy today is it ain't my fault.