New Panel Prep

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Wildthing

Should the black coating on new parts just be scuffed and epoxied or completely removed?
 
It depends on the quality of the coating. Genuine e-coat need not be removed, but it should be very well scuffed with a red scotchbrite. If the primer does not soften with the application of reducer, it is probably e-coat. If reducer softens the primer, it should be removed.
 
The reason Im asking is because of an aftermarket bumper cover that I bought a couple years ago. It was obvious to me that the primer on it was total garbage, so I sent it back, because I didn't know how to safely strip it (nor did I want to take the time to do it). I ended up spending considerably more on a used oem bumper cover. Could I have easily stripped the bumper or did I make the right call?
 
A few months ago I bought a Full Quarter for a 69 mustang and found several spots of surface rust right under the the E coat. I doubt it would have affected anything as it was sealed from oxygen but I went ahead and stripped it down anyway. passenger side quarter  (2).jpg
 
strum456;15798 said:
The reason Im asking is because of an aftermarket bumper cover that I bought a couple years ago. It was obvious to me that the primer on it was total garbage, so I sent it back, because I didn't know how to safely strip it (nor did I want to take the time to do it). I ended up spending considerably more on a used oem bumper cover. Could I have easily stripped the bumper or did I make the right call?
I would never strip a new bumper. If the primer is no good it should be returned like you did.
 
fastwayfirebird400;15823 said:
A few months ago I bought a Full Quarter for a 69 mustang and found several spots of surface rust right under the the E coat. I doubt it would have affected anything as it was sealed from oxygen but I went ahead and stripped it down anyway.
That quarter was obviously treated with a substandard process, so you also did the right thing. I gets to be obvious after a while which parts have a quality process and material, and which ones don't. Restoration parts generally have been the last to move to modern metal treatment and priming processes. Almost all the new car aftermarket parts have pretty decent primer these days, even if they still tend to have fit issues.
 
strum456;15798 said:
The reason Im asking is because of an aftermarket bumper cover that I bought a couple years ago. It was obvious to me that the primer on it was total garbage, so I sent it back, because I didn't know how to safely strip it (nor did I want to take the time to do it). I ended up spending considerably more on a used oem bumper cover. Could I have easily stripped the bumper or did I make the right call?

how did you know the primer was garbage?
 
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