Painting question

[Steve Plucker]

So you have two parts...

The first part was sandblasted and has kind of a blue-grey appearance...

The second part was cleaned up by using just a wire wheel brush to a nice shinny silver metal color...

Now you are going to prime the parts with paint.

Will the part that has been sandblasted hold and adhere to the paint as well as the wire brushed part or not?

Thanks.

Pluck

[Farrell In Vancouver]

I think you'd have a better profile for adhesion using a sand/glass blast.
Often I'll blast first and wire wheel it after to ensure it's really clean.

[Phil Brown]

I've found that the wire wheel tends to polish and smooth out the surface and a lot of times the primer will not adhere very well. Blasting gives the surface some "teeth" for the paint to lock into.
Epoxy primer on a blasted and cleaned surface is there to stay

[nick c]

I've been sandblasting and painting for 30 yrs, theres nothing better for paint or primer to adhere to than a blasted surface. If you used a fine sand, it will produce a smoother finish than course sand. I prefer the sandblasted over the wire brushed.

[Russ/40]

Wire wheel first, blast second, then phosphate treatment. Can't do it any better than that. Probably skip the wire wheel.

[BRENT in 10-uh-C]

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Steve, the answer to your question lies in the type primer you are using. If you are using a DTM 2k Epoxy primer, then it does not matter. If you are using a 'self-etching' primer, then neither surface finish matters. If you are applying polyester primer (such as Featherfill or Finish-Sand) you are going to want to 'tooth-up' the wire brushed surface. Look at the data sheet for the material you are spraying for your answer.

[Tinbasher]

Both systems work for cleaning the metal. The wire brush will leave a smoother visable surface, but the wires actualy hook the surface if looked under a microscope. This when painted over will leave a air pocket under the primer and promotes corrosion. A metal prep will help and a etch primer. I'm still a big believer in sandblasting( After the Paint is stripped) and Epoxy Primer. Worked for me for 30 years and the cars still look good. My thoughts. JP

[Steve Plucker]

Thanks guys. Great information. Much appreciated.

Pluck