Spraying/painting hard to reach spots?

[KAILUAZ]

I'm going to start painting my undercarriage. Trick is I'm using a brush and spray cans (Rustoleum BBQ Black). I'm looking for ideas to get into those hard to reach spots inside the frame rails etc.
Thoughts on something I can attach to the spray cans?
Thanks

[killerMikeD]

straws like on those wd-40 cans, or use a Wand, and pressure gun type system.

[KAILUAZ]

I thought about the WD40 straws but wasn't sure if it would just shoot out a stream,,, I'll mess around with that, thanks.

[killerMikeD]

OR, you can go buy a cheap automotive spray gun like lowes or something, pour the paint in it, and spray it these guns have an adjustable fan spray pattern similar to a water hose sprayer, and you can make it into a good stream to cover hard to reach areas, only thing is you need a compressor.