I’d say I had reasonably coarse hair on my arms. I’m 8 weeks post treatment number 4. Currently, I have patchy regrow; some areas have quite a bit of hair and others sparse but for the most part it’s fine. Even though I haven’t shaved in 3 weeks and the hairs are few mm long, they feel soft and not very noticeable if I move my hand across my skin. Since I’m being treated with a YAG laser, I may not have any more treatments as I’m not sure if it will work on the remaining fine hairs. I did always expect only to achieve a reduction. If I want further reduction, I will probably have electrolysis done.
So, if you’re hair is suitably coarse, I’m sure you can get a good reduction at least. I will still probably shave or wax as I like the look of hair free arms but I imagine it will be less frequently than I used to.
My sister has coarser hair than mine and has had 1 treatment so far. Hopefully she will get better results but only time will tell.
You can see the post linked in my signature for photos of both our arms before. I will hopefully be updating it soon.