one coat, i presume that is thistle universal.
which is applied , ruled off, left to pick up, sponge float to bring up fat, trowel up.
setting time can be slow
a usefull plaster on the right job. we have recently used thistle universal on a restoration of an old mill, the plaster was not decorated. after the plaster had dried out we applied a coat of lux washing flakes mixed with water with a sponge and polished with a lambs wool cloth. if ever the owner wanted to decorate at a later date the lux flakes would be able to clean off the plaster quite easy.