Hi, got a bit of an issue levelling extension floor (concrete) with existing (suspended timber) floor. There was a bit of a slope from existing to new floor so used dunlop LX40 SLC on the extension floor but there is still about 3mm slope. My question is can i use acrylic primer on top of the existing self levelling compound which has set and pour more on top or would it be ripping out existing and starting again? Will be putting LVT click flooring on top.