You keep saying traction control. Traction control feels different in different cars.
If it makes a popopopopopopopopopop noise at full boost then its a missfire.
Take a video or something
I use this stuff gor random bits. 1 can will come close to doing a bonnet.
The only problem is that it is not durable at all. Stone chips will come up very easily.
I think you should do your bonnet or roof first to get a feel for the stuff.
Also to make it look even on a large surface is a pain