Previously I've applied sealant to my walls (new house) then hand sanded it with one of these on a stick...
Problem is it's very manual and boring plus I have a whole lot of walls to sand in the new house so looking for something better.
Can I use something like this to do the job or is it too powerful? I know it can be used on gyprock to sand back the joins, but I'm talking about just sanding back the sealant on plastered walls.
Jobs like that are what apprentices are for @ProjectPete!
Have you tried just using an orbital sander? Might get a bit hard on the arms though. This Bunnings article recommends an orbital sander for plaster walls - https://www.bunnings.com.au/diy-advice/paint/paint-preparation/how-to-sand-walls
Yeah I don't see the orbital making it easier. And I still think that or the one I linked above are too strong/powerful for standard plaster walls.
Smoothing joins on plasterboard walls, sure, but not convinced I can get away from the pole sander on this one.