Although it is correct to double coat (2 sets) of skimming Plaster into the surface area, recognizing when it is time to lay on the second coat of Plaster into the initial one will certainly depend upon a couple of elements to think about prior to you can use this 2nd layer, such as, the size of the wall surface area to Plaster into, verses the drying time of the initial layer of applied Plaster. The surface history & exactly how it is sealed prior to plastering it to begin with. The room temperature and even just how you mixed your Plaster to name yet a couple of.
As soon as you have laid your Plaster completely into your wall for the lam thach cao ha tinh initial layer, quickly wipe your trowel & commence to get some of the lines & ridges of this very first layer, by starting at the same place on your wall surface that you began laying on Plaster in the first place, by following the exact same ‘Plaster application technique’ only this time you are Toweling out a few of the ridges & Trowel lines.
Please keep in mind, at this Toweling up phase, you are not trying to obtain the best finish to your surface, you are just helping it by making it flatter all set for the 2nd coat of Plaster.
Trowel out, from the leading left hand side corner of the wall surface, nearest the ceiling, that is, if you hold your Trowel in your right-hand man, remembering to take note of your edges & ceiling lines, squashing over Plaster, & filling in any gaps as you go along, with Plaster that is overlapping into the wall edge/ceiling alongside it, (if it hasn’t already as well gone solid) moving over towards the much best side edge, and afterwards move back over to start Toweling out from the centre to bottom left hand corner & ultimately ending up in the direction of the bottom right hand side of the wall surface.
Then when you have actually completed this, you can after that blends some even more Plaster to use this 2nd layer into your reasonably smooth & level (Plastered) surface area.
Preferably, the very first coat of Plaster that you have actually applied, then Shoveled out a few of the marks and also lines, ought to now be sensibly strong to the touch when you have actually completed Shoveling out, but you should not allow this very first coat to come to be as well strong to the touch or else when you apply the second layer of Plaster onto it, it will dry out into the first coat as well quickly, therefore not adhering, as well as it will dry too rapidly to make sure that you cannot complete it to the called for smooth and flat coating.