Found rust under Ecoat

Arrowhead

Arrowhead

Oldtimer
I know it's been debated on whether to remove ecoat or just sand it an move on. I tend to err on the conservative side and sand it all off at least on the outside of all the panels. Granted I've never found an issue with it - until recently. I DA'd the new aftermarket hood and fenders for the '57 I'm working on and found clean metal no problem. Moved on to the trunk lid and it was fine also - except one area probably about 6" in diameter that seemed to have surface rust under the e coat. I did notice that it didn't feather as well either which might have been a sign of poor adheshion which could cause issues down the road, not to mention the surface rust. Who knows, even if I hadn't sanded down to bare metal it would have still gotten two coats of SPI epoxy so it might never have been a problem. But I can sleep easy knowing that I'm starting with clean bare metal. Just an FYI.

IMG_20151127_190724_540.jpg
 
This is not the first I have seen.
What happened is these companies will have a fender or so made and the first batch comes with everything but epoxy (ecoat) on them, then shops bitch and they go back to supplier and they have a come to Jesus meeting and they start using a real ecoat. BUT! the problem remains if the part is an old original in storage for years, then its buyer beware.
Every panel should be spot tested first.
This must be stripped, epoxy over it can only do so much.
 
That's why I strip it off most times as well, I often find rust under E-coat that looks perfectly fine. In most cases I think the rust was there before they coated it, NOS original sheetmetal is the same-find rust under it all the time.
 
I once worked at an industrial painting Co. and they E-coated parts, (still do today). Sometimes when going through the process they go through a wash and if the line wasn't set right the E-coating would be applied to a part that was still to wet and the E-coating would sometimes cover the rinse and go through the dry cycle and you could see the run off. Under that no E-coating would stick. So if your doing something worth while I would sand it off just in case something went wrong on the line.
 
Most of Rusty's pictures show he sands off all ecoat before epoxy
 
Senile Old Fart;n78931 said:
Most of Rusty's pictures show he sands off all ecoat before epoxy
Click to expand...

Extra work but not a bad ideal, even on new OEM parts made in the USA by the big three, as they have been shifting to waterborne e-coats and of course the off shores e-coats have been getting lower grade by the year. by the year.
 
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