How would I stop sand and cement rendering going off so quickly as i am rubbing it up.?

Question

How would I stop sand and cement rendering going off so quickly as i am rubbing it up.?

Answer 1

wet the wall and mix your cement for at least 3 min. and then let it set a minute and mix again...will help a little...there are chemical retarders you can add but i stay away from them...

Answer 2

If I understand the question correctly, you could put a sealant on the concrete.  There's quite a wide variety out there.  If this is interior concrete, you could simply paint it.