if you use the right epoxy(high heat)and rough up the surface it adheres to with 40 grit paper to give it some thing to stick to, it should be ok. especially if its trapped between two surfaces like gap. plus its pretty soft stuff if it has no filler like aluminum or iron, chances are if it came loose it would blow thru and out your exhaust pretty quick without any damage. back in the day Petty enterprises did port reshaping with epoxy.