Powdercoated Tumblers

Well a slight change in plans for the next tech right up, we are going to talk Powder Coating first.

In theory the powder coated tumblers should have been the best substrate to start coating, versus starting with a raw stainless cup. The powder should be applied over a prepared cup and easy to topcoat. Stainless is not an easy metal to paint or coat and get proper adhesion. We will talk about that after I test a few more primers out that I see being used by your group.

But reality has set in. The powder coating that is used (at least on Ozark) really is some crap. Sorry Mr. Ozark, calling a spade a spade. In fact I have never seen such a crappy powder coating as what was used on the tumblers that I worked on.

Keep in mind. There are as many types of powder coating as there are types of paint.

Here is what happened. 
1. The powder coating was so solvent sensitive that wax and grease remover totally desolved the powder coating and the rag actually stuck to the soft powder coating. This left imperfections that needed to be sanded out.
2. The tumblers that I have in my possession, the powder coating is so textured that it needed to be sanded to smoth it out. The wine mugs were nice and smooth though.
3. The powder also allowed the solvent to "bite" in and cause some orange peal or texture after topcoating even though it was fairly smooth before topcoating because I had sanded it smooth.

Now the good. The powder coating had been applied over a good clean surface and did have good adhesion.

So why does the original factory powder coated tumbler strip easier than one where the coatings are applied to a raw stainless tumbler? The solvent sensitivity is that answer. Your acetone is just washing that powder off. If the tumbler had good powder, this would not happen. It isn't how well the tumbler is prepped.

So, I am backing up on my thoughts that powder is going to be the best starting point. I am changing to raw stainless unless a different brand of powder coated tumbler that was done properly is found. Or if someone steps up to the plate and actually puts a good coating on the tumblers.

After I do a bit more testing of some products, I will do the next tech write up on coating raw stainless. Feel free to post what product you start with when coating raw stainless tumblers.


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