Leak at rear of oil pan, could it be the girdle?

Recently fired up my fresh built 512 and almost immediately noticed what looked to be a rear main leak. Not wanting to pull the engine again so soon, I decided to try to tackle it with the car on jack stands.

I went with the new style seal from fast fish this time. The install was pretty straightforward and it seems like a good product. I sealed everything back up and let it dry overnight.

The next night I filled with oil but did not fire the car. I came out the next morning to a puddle near the rear of the engine, and it looked to be leaking from 3 of the 4 bolt locations at the back of the pan. I removed those and put some thread sealant on and reinstalled, this time using a set of the oil pan rails I had bought in the meantime.

The next morning there is still some oil leaking, but it no longer looks to be coming from the rear bolts, but rather the rear corner of the pan.

So, my question is - how are you guys that run a girdle/windage tray/pan setup getting yours to seal?

I use 2 gaskets, but not one between the girdle and the block. Just girdle to tray, and tray to pan.

I think I just didn’t get the girdle sealed to the block well enough. I just used the sealer I had on hand (ultra gray.)

Before I take it back down to try one more time I was wondering what you guys were having luck with. Ultra black has been good for me in the past. I know some like ‘the right stuff’ also.

Thank you for reading, sorry so long winded.