Oliver is shorthaired and he doesn't need so much glooming, but I try to do so more often right now as he is shedding a whole lot more due to change of the season. It is often problematic, not that he dislikes it (if he does he would scamper away and hide!), he would stay right by me but he thinks the brush is a sort of a toy, gets frisky and insists on playing with the brush. I have to hide the brush afterwards because he keeps on attacking it.
But when he chooses to, or when he is very sleepy and relaxed, he lets me gloom him without any fuss. So I just have to wait for him to be in the right mood!!