Valve Cover powder coat bubbling due to blocked crossover ?

[Shane Kelley]

Even though they probably look great when you got them back. I suspect that 400 degree bake is effecting the issue. The porosity is possibly releasing gases that eventually lead to the bubbles. IMO

I bet if you had a brand new set they wouldn't do it.  I recommend painting them and bypass the big bake temp. 

I agree that it's probably not the powdercoaters fault.

[cudabob496]

It has to be the powder coaters responsibility.  If he can't powder coat
aluminum, then he should say that up front!

How about baking out the impurities in the aluminum, before
putting on the powder coat??? Duh!

[Shane Kelley]

Maybe that would work. I don't know. 

[GY3R/T]

It has to be the powder coaters responsibility.  If he can't powder coat
aluminum, then he should say that up front!

How about baking out the impurities in the aluminum, before
putting on the powder coat??? Duh!

Not as easy as it sounds.  Old used casting = porous , impurities and oil saturation. Cant bake out all impurities.
   I would simply paint old casting or buy new and powder-coat inside and out. (if powder-coating is that important).      I wouldn't blame the company.

[Racer57]

 They were "outgassed" before anything got done for 3 1/2 hours which is basically cooking them longer and at a higher temp than is used for the coating. But apparently that wasn't long enough.

[GY3R/T]

   How much money/time do you want to spend ?

[Racer57]

Update...

I'll try to play nice and not tell who the powder coater is because I've been around long enough to know that sheet happens.   They have now seen pics of the outside of covers with bubbles and the interiors with no sign of anything out of the ordinary(which she admits). Even after seeing that the temps of the effected area that were taken with an infrared temp gun shows 200degree range, they are still convinced that my Valve cover problems are because the crossover is blocked and creating heat in excess of 400 degrees despite the additional fact that the wiring harness from the alternator and plug wire also show no sign of heat damage.   In all fairness, during my last discussion I asked if they would treat me right if I sent new ones to them, she did say yes. However, I'm tired of screwing with it and got some covers that I like as they are.  End of Story.

[RUNCHARGER]

Hmm: Well. you're doing the right thing. Sometimes it isn't worth going crazy trying to make something work when a different direction can be taken.

[cudabob496]

He chose the path of peace

[JS29]

He chose the path of peace

Or the path of least resistance!

[Shane Kelley]

He chose the path of peace

Or the path of least resistance!

I tend to do the same thing.

I'm in business fixing wrecks. Everything in the world fights you along the way and perfection is always easy to ask for. Just because something is not perfect doesn't mean that a experienced person didn't do their best. Sounds like the company offered to redo them so what else can a reasonable person expect?

In this situation I really believe the oil soaked aluminum is the culprit.

[RUNCHARGER]

Yes: I think this is one of those deals that really no one is wrong. If I was the Powdercoater though, I would keep this in mind in the future if a similar job came up.

[Racer57]

Yes: I think this is one of those deals that really no one is wrong. If I was the Powdercoater though, I would keep this in mind in the future if a similar job came up.

"In all the years of doing this, this is the very first time this has happen. So, its has to be because you have your crossover blocked. "

[GY3R/T]

Yes: I think this is one of those deals that really no one is wrong. If I was the Powdercoater though, I would keep this in mind in the future if a similar job came up.

"In all the years of doing this, this is the very first time this has happen. So, its has to be because you have your crossover blocked. "

Just curious.... In your communication with ths company ... you did say,  She would powder-coat new covers ?   

[Racer57]

Yes: I think this is one of those deals that really no one is wrong. If I was the Powdercoater though, I would keep this in mind in the future if a similar job came up.

"In all the years of doing this, this is the very first time this has happen. So, its has to be because you have your crossover blocked. "

Just curious.... In your communication with ths company ... you did say,  She would powder-coat new covers ?   

Misunderstanding somewhere. They think that I would have the same bubbling due to temps over 400 degrees no matter what I send them because they have done everything properly on their end.