Another concern would the stability of most of the inks found in most home, inkjet type printers. Although the clear coat will make them fuel proff, what I have found to be the problem is the UV degradation over time. Your nice decal will start to fade out to a mear ghost of it's original printing.

It's been my experience that about one season is all you can expect to get out of a full color print from an inkjet before the fading becomes very obvious.