small parts prep

[jblueridge]

I do not have good luck with painting small parts; I use wax and grease remover and then self-etching primer but the top coat (and primer) seems to chip off fairly easy a week after.

I think it is my prep methods that are bad.

How often should I replace the paper rag I'm cleaning with?
How often should I change my gloves?
Any tips would be appreciated.

 

[Curt]

Do you use quality 2 part paints?

I prefer epoxy primer over the etching ones.

 

[Jay-]

I took all my smalls to a dustless blasting guy who does them when he does the large jobs.
Its cheap?

 

[Tysano]

What type of paint are you using.
If you are using rattle can, spray your color on while your primer is still tacky.

 

[cruiserpilot]

There is a final prep you need to wipe on after the grease remover, it is hard to get that
film off. do you use nitrile gloves? lint free wipes?

 

[jblueridge]

I use the lint free shop wipes from the auto body supply store.
I bead blast most of the parts, then wipe down.
I usually use self-etching but I don't get any better resuls.

For my pto winch parts I blasted, wiped with W&G remover. Then I treated it with PickleX 20. Wiped again with WG remover.
I used ppg Omni 2 part epoxy primer, waited a day then topped with VHT epoxy paint (rattle can).
Now waiting for the 7day cure to elapse.

 

[Splangy]

Your problem is probably that you're using self etching primer. You should paint directly over etching primers. Etching primers need surfacer primers applied over them prior to paint. Use an epoxy primer over bare metal. Superior adhesion and performance to etching primers.

 

[Splangy]

What type of paint are you using.
If you are using rattle can, spray your color on while your primer is still tacky.

Or just follow the p-sheet of the products you're using. You need to give sufficient time between prime and paint as directed by the tech sheets

 

[jblueridge]

I am pretty good about following the directions.
I have paint directly over self-etching paint... maybe that's the problem.

I usually do the self-etching when painting just a few items.