The sand paper comes in a number of grits (courseness) the lower the number on it the courser the grit and therefore the more deeply it scrapes the suface. In wood finishing we use the sandpapper from the lowest to highest grite to give the woods surface as smooth a finish as possible and so that the finsh materials like. french polish, varnish will give an almost mirror like finsh. On a door we use it to knoch back any small blemishes to the point where we can start appltying a varnish or wax only polish. as we ally each coat we use a very "mild" sandpaper to remove an dust specs that could have landed on the surface of the door as it dried. it also provieds a key so thatthe next coat will"stick". Placing any finish on wood means the next coat will not stisk as evenly as it going on a shiney surface. We "key" the surface and then using a "tack rag" which is slitly sticky we remove any dust then reapply a new finish coat we do the same for painted surfaces as well.
To knock out the irregularities of the door
Car painters.
Hen houses have two types of doors: larger doors for human use, and smaller doors (pop-holes) for fowl use.
Sand is insoluble and can be separated by filtration.
Use a sieve to allow the sand to pass through, leaving the iron nails behind. Or use a magnet to attract the nails and remove them from the sand.
It is more simple to filter water to delete sand.
Because they work much better for the purpose than chainsaws do.
computers
They have to measure what paint to use and what size canvass
Well We can say Color because this can influence painters to be creative.
As far as I know, painters don't use knives. What I think you could be asking is a putty knife used by drywallers.
Car painters.
To create layers of paint that reflected light
Use the cie link below for past papers; use the sanskrit link below for current papers.
The doors use magnets to hold them shut. The doors have knobs for opening.
Grey and brown, mainly.
Use calcium carbonate or calcite based sand; usually called 'aragonite' sand. Do not use play sand (ie, silica sand) or normal sand, it will cause massive diatom blooms.
Hen houses have two types of doors: larger doors for human use, and smaller doors (pop-holes) for fowl use.