First....painters usually have problems with RR. It doesn't apply anything like regular paint - and if you paint for a living you know how to apply paint - not RR.
First start with a well sealed wall - nothing lower than a satin sheen. If the RR dries too fast it can leave lap marks. The higher sheen below it can help it from being absorbed by the wall.
RR should be applied at about 75-100 square foot/gallon. Properly applied, you almost think it will sag it is so heavy - it also should have an orange peel texture to it.
The roller should be reloaded after every 18 inch square - this is a mistake people often make.
The final floor to ceiling pass is done with a dry roller.
As for cutting in - you have to cut while it is all wet - a section at a time. It is best done with a brush - by dabbing - or using the RL trim roller and just rolling right up to the tape.
Do not overlap your seams.....and most importantly - on the second coat - stagger your start line about 6 inches - that way you are not going to recoat any lap marks from your first coat.
This works - I have done it many, many times - and haven't had a problem.
River Rock isn't a regular wall paint - you can't expect it to apply like one.
Also, may I humbly suggest that you practice before you take a paying job applying the product. It took me a while to get used to it before I was comfortable applying it.
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