Raptor is great. I've had it in my tub for 4 years and after a good cleaning, it still looks new.
Go borrow a deadblow hammer or body hammer and beat the bump back down. Walk the hammer around the bump and work your way in... Hitting it directly in the center will make it oil can the other way.
Also... When you spray the raptor... Start each coat on the upper parts of the tub... That way if some dribbles out of the gun onto the tub, you can correct it.
2006 I6 6-Speed X, 33" Goodyear Duratrac, 8.8.