Well seeing how some of the biggest certificate holders use stickers for stuff, I'd say yes.
Also why would I pay you for your time, buy parts etc, and not put the logbook entry you gave me in, I mean if I wanted undocumented work why would I bother paying a APIA for it, anyone can do undocumented work lol
Depends, are we talking about finding something on a annual?
Seems many APIAs don't understand what a annual is, it is a inspection, and when someone pays for it they pay for the plane to be disasssmebled as required and re assembled, doing the work on any snags is often also delegated to the APIA, however that is not always the case, nor is it required.
If I pay you for the inspection, you find a issue that I don't have the money to fix, don't want YOU to fix, or whatever, you still have been contracted to finish the rest of your inspection and put the plane back the way you found it, complete with a list of any snags that need to be addressed. Refusing to reassemble is not only a sketchy way to try to force me to give you more busiesss, but in the above situation it's also showing of a lack of professionalism and a probably a breach of contract.