I came to them to re-glue the windshield molding in Renault Espace (I didn't really care about the price), the master refused due to the fact that you need to spend "a lot of sealant" on a 40 cm long molding. It was done in another service in 10 minutes. And yes, there was no need to use a sealant there.
Conclusions:
1. Or not competent.
2. Or lazy.
3. Or he doesn't want to earn money.