can I plaster the wall for 1 cm each time for 2 times instead to do it 2cm one time. I mean first I will plaster for about 1cm and leave it for 7 days and cone back add on the second time 1 more centimeter. should it has advantage and disadvantage. would u please answer these questions. which one do u think it will be stronger between plaster one time 2cm, do it 2 times times.