Exhaust leak help
 

I have a 2017 brz that came with aftermarket front pipe and catback. Unfortunately though, the front pipe section that bolts to the catback has a standard flat flange while the catback section that bolts to the front pipe has a donut flange.
As you can already guess I've been dealing with a small exhaust leak. I've tried using a donut gasket paired with a standard flat gasket but still getting a small leak.

My question is, has anyone run into this issue and have a solution that does not involve cutting and re-welding a matching flange?

https://www.permatex.com/products/ga.../?locale=en_us

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I always see this but how do you apply this stuff?

Bubba suggests - :D

(I see ol @jflogerzi got ya covered)

With your finger or a popsicle stick - :D