i just modified mine this weekend,i used a pipe welded in so i can clamp a drain hose on,
i still need to cut the length back but its a quick easy option
if the acrylic enamel is activated it should be fine. if its enamel thats ready to spay with no activator or hardener then toss it in garbage
you can always do a small test panel on a pop can to see if it reacts
not bull, the cam sensor needs to set, this tells the ecu where the engine is in its cycle so it can calculate injector pulses it is sequential not batch fire