DP to Turbo Gasket or RTV or both

[Sweet6]

I had a small leak from my ATR DP and my turbo. I had the ATR copper gasket, but it did not look too good when I took it apart. I am leaning towards using just Copper RTV. Let me know some of your experiences with this.

TIA

 

[UNGN]

Lap both surfaces flat and use the copper gasket. (I use a 6" sharpening stone that was $2 at the hardware store)

I can't see how this would leak (Unless your exhaust system has a ton of backpressure)