trad Vs wfp. incidents of skull fractures and death lower with wfp than trad, can be quicker with wfp. with trad when you walk away you know there are no probs with the finish.
undercutting.
if you charge what you feel is the right price and the customer accepts that price then you have not undercut. if you ask what the other guy charges and deliberately charge less you are undercutting.
you are in business, charge what you feel is fair and everything will work out.