Black EDP coating?

[toddscharger]

What do you have to do, to prep a replacement body panel that is coated with the black EDP coating prior to painting?
Is EDP a primer?
Will it need to be scuffed?
Should it be coated with a primer or an epoxy sealant after scuffing?
Is it weldable, or should the area to be welded,  be cleaned of all EDP before welding?

Any insight would be greatly appreciated, particulary a "Step by step" sequence.
Thanks,
Todd

[bull]

EDP in the reproduction sheet metal industry is nothing more than a thin coating of epoxy primer (possibly a powder coating) to keep the part from corroding in storage or during transit. Every body repair person I've talked to just rubs it off with something like Scotch Brite before, during or after they install the panel. The EDP you're referring to has no real purpose for someone who's trying to do body work but you can use regular epoxy primer for body work although most people use gray filler primer. Some guys use different colors of primer to help find high/low spots. You can weld on it but it will just burn off as you go. My entire car was coated with thin epoxy before I took it home from the body shop as a cheap way to protect the car from rust while it sat for a long time and I was told to not expose it to the elements directly. It was removed before the painter started his process.

[69 OUR/TEA]

toddscharger,EDP,Electrodeposition Paint,or its full name, Electrophoretically Deposited Paint is applied to these panels in a far greater way of preparation than body shops do with prep sol cleaners and solvents .E-coat can withstand salt test spray longer than most leading paint manufacturers epoxys,and from the past as I had learned it was best to leave on where you can other than where you are going to weld.The paint I use is PPG,and in their tech sheet on their DP epoxy primer states that it can be applied directly over properly cleaned E-coat(no scuffing needed),done it many times,but it would'nt hurt to take a scotch pad to it and put some mechanical scratches to aid the adhesion.The only thing E-coat is not good at is withstanding UV rays as it will chaulk out.If it's a new panel,leave it on,apply epoxy over it,then your high build primer,  sealer or paint and be done. My

[Charger-Bodie]

toddscharger,EDP,Electrodeposition Paint,or its full name, Electrophoretically Deposited Paint is applied to these panels in a far greater way of preparation than body shops do with prep sol cleaners and solvents .E-coat can withstand salt test spray longer than most leading paint manufacturers epoxys,and from the past as I had learned it was best to leave on where you can other than where you are going to weld.The paint I use is PPG,and in their tech sheet on their DP epoxy primer states that it can be applied directly over properly cleaned E-coat(no scuffing needed),done it many times,but it would'nt hurt to take a scotch pad to it and put some mechanical scratches to aid the adhesion.The only thing E-coat is not good at is withstanding UV rays as it will chaulk out.If it's a new panel,leave it on,apply epoxy over it,then your high build primer,  sealer or paint and be done. My

I agree with all of this , with only one exception; do not scuff the Ecoat ,it ruins the chemical adhesion. you either need to sand it thouroly (which with Ecoat kills its corrosion resistance) or dont sand or scuff at all ,and keep the benifit of the corosion resistance and rely on the chimical adhesion.

Sanding=mechanical adhesion

Not sanding=chemical adhesion


...............and keep in mind this only applies to Ecoated panels and the proper materials must be used to go directly over Ecoat, so be sure to check youre paint supplier to use the correct material IE DP epoxy(ppg) colorbuild sealer (Sikkens) ETC 

[AdamMopar]

I scuff and shoot it with a coat of epoxy for what it is worth.  It's a great coating, don't remove it unless you have to.

Read your P sheets for your epoxy it will give you the best procedure.

Make sure it isn't an inexpensive coat of black lacquer priimer put on some repo stuff.  Try taking some lacquer thinner on a rag and rub on it.

Adam