Any such thing as Hardener that can be applied to filler post drying?

Bowlzi

New Member
I have plastered under the stairs but was not happy with the joins between curve and straight run so I have used jointing compound filler ( as used on tapered plasterboard)
Can I make this as hard as the plaster skim coat as I think it may be too soft to take knocks etc ( such as when people move furniture up stairs)
Think concrete can have a hardener added on floors ...
What would SBR do?
Go easy on me as I've not done anything like this before.
Cheers!
 

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