paint question

[nascar_fan28]

well im planning on doing some undering coating on my truck mainly frame axles. thought about just doing some sanding and black rattle can paint. any thing that will hold up better? im thinking cheap minded. im not gonna do the eastwood 3 part paint process.. i dont mind repainting every spring. and second question, just picked up a rear bumper im gonna paint match, i bought my paint for all my other color matched stuff from local paint shop and it didnt match worth a crap. any good online places to buy paint to match paint? thanks guys for the help
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[melmount]

i would paint the underside with spray can truck bed coating. It dries harder then undercoating and oil does not goo it all up. Good stuff.

 

[nascar_fan28]

thanks that sounds like a good idea, im gonna maybe use that on inside door jams for sure