Doing knockdown to drywall is there a certain amount of time to wait once texture is sprayed on and any feed back on how and where to pull the mud with a 20inch knife.Like pull out the corners first or just start in the corner? How much preasure to put on the knife? how thick our lose the mud needs to be to be sprayed in the hopper. any secrets to doing all the phases of this would be very helpfull to this greenhorn!! Thank you!!
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We had a company do a "knockdown" job 4 years ago and they waited until the texture was completely dried . They then hit it with wall sanders and it came out incredibly well. Talked to the guys and they said that it is the easiest way for them and they don't need to wait around until it dries. Just come back the next day and sand away. I then hit it with a coat of PVA sealer, two coats of paint, all with an airless and no rolling. The paint job came out even and smooth, with no snags/rough edges. We also applied a primer after the taping was done and before texture. This was also recommended by the drywall guys. One more step, but no lap lines in the finished product. It does require another step in the process and additional primer, but is worth the additional cost.
Just did this job yesterday on my family room addition. The wait time is dependant on your temperature and humidity. Yesterday was hot & dry in southern Cal and I was a little worried about it drying too fast and getting away from me. I was using a fairly hot mix and it was setting up in about 15-20 minutes after spraying. I was working alone so it was, spray 2 walls then finish, worked out great. The amount of pressure on the knife is a learned touch dependent on the finish you are trying to achieve. More pressure = flatter texture. The key is timing. Wait too long and you can do like the previous post by sanding. I prefer the traditional method of dragging the knife over the mix just as the "peaks" are turning white from drying. I hate sanding and the dust is a mess, do it wet.