Suggestions for Engine Cradle Epoxy Repair?

[axh174]

So not too long ago, I decided that, since I've gotten most of the mechanical and electrical demons squared away, it was high time I turned my attention towards some more preventative maintenance aspects of the car. Specifically, repairing some of the flaking/delaminated epoxy on the frame.

My intention was to start on the underside of the engine cradle area by removing the bad epoxy, sanding the exposed metal clean, and then applying some POR-15. However, as I started looking more closely at the cradle, I noticed there was some flaking epoxy around the passenger side cradle drain hole, as seen in the center of this pic:

IMG_2074.jpg

Taking a closer peak inside the drain hole, I see this:

IMG_2080.jpg

Peaking in on the driver side drain hole, I see this:

IMG_2087.jpg

Well that's not good.

The rust beneath the epoxy appears to only be surface rust at the moment; I've gone around poking/knocking/pressing against the various accessible sections of the frame and it all feels and sounds solid. Additionally, I keep the car garaged and try not to drive in inclement weather, so I'm not really worried that the frame's strength is becoming questionable.

Obviously, I'd like to take care of this before it becomes a problem. But seeing as how these drain holes lead to the boxed-off interior portion of the engine cradle, I'm not quite sure how to proceed. I was thinking of getting a coat hangar or something and trying to remove as much of the bad epoxy as I can before using a can of some sort of frame sealer with a flexible hose and spraying it in there. Probably not the most ideal solution, but at least then it would be better protected than it is now. Doing a frame-off and baking the epoxy away really isn't an option for me (not in the foreseeable near future anyway).

Does anybody have any suggestions, tips or tricks for dealing with bad epoxy in these areas?

Thanks in advance!

(Also, sorry for the orientation of the pictures; they're all supposed to be 90 degrees clockwise, but I can't seem to find a way to adjust that.)