That’s the fibres.
What did you mix it with, and how long for?
But if you only mixed half the bag then the fibre to aggregate ratio is no longer correct meaning you probably have more fibres in the floor than aggregate to set it.
To be honest it doesn’t matter how long it was mixed for or how fast or slow it was not going to be right.
Don’t loose heart, wait until it’s set, you’ll know if it hasn’t worked.Okay thanks
Don’t loose heart, wait until it’s set, you’ll know if it hasn’t worked.