Before applying the finish, the project should be sanded with sandpaper in grain 150 to 180 before finishing. Be careful when sanding with an electric sander, because if you sanding the plywood veneer layer, it can be quite thin, so that you can easily sanding through the bottom layer without realizing what is happening. Keep your sand in line with the wood grain when grinding and sand in all directions to avoid visible scars in the grain.
I recommend using 80 grit sandpaper for this work and having a staple cloth handy to help remove dust and dirt caused by the sand. When you are finished sanding, wipe the dust with a damp cloth and let the workpiece dry. After you have cleared the sandy mess, you can proceed to step 2 of the process.
If you choose a powered orbital sander for light sanding, you should be careful not to sanding through the thin outer layer of plywood. Since softwood layers are often what many do-it-yourselfers use, you should consider sanding in several steps. When sealing or even varnishing the laminated wood, apply one layer on one side only.
It is a good policy to sand with a quigglie, unless you apply a stain, preferably one that stains the sand side with the lowest gravel, such as about 150. For example, progress to the last grinding grain, 180 - 220 and then to a final grain of 200 - 300.
When sanding on a flat surface, use flat blocks to secure the sandpaper and advance to the next finer sandpaper. Use the same grain of sandpaper that you used in the last machine sanding, but use a finer grain that you can use if you sanding a little longer. Remove all ground dust by one of the three sanding methods, it is most efficient to use all three.
Now that you have selected a random sander to work with the orbital sander, it is time to select the right coarseness and grain of sandpaper to use on your wooden deck.
On the other hand, high grain paper does not remove as much and gives an ultra-smooth surface. Sandpaper is evaluated according to the number of grains of sandpaper, the grain size and the thickness of the paper on the surface of your deck.
The recommendation for wood sanding is to start with coarse paper (80 grit) and to give the surface a smooth run. Machining the board with a planer or blunt knife requires coarse grain, like veneer, but is a good choice for a smooth, smooth surface and not too rough.
For example, you can finish the surface with 180 grits, but you can also start with a bit more coarse paper (80 grits) and a bit more sanding. You don't want to start with grit that is too coarse, because it would be a total waste of time and energy and you risk grinding from scratch.
You usually use fine sandpaper and aim for a smooth wood surface by making it look fine when applying the paint or topcoat. You should notice that the wood increases in grain when the surface is painted, if it has been sanded with a primer before. Sanding without primer ensures that the finish is vibrant and not blunted when the top coat is applied, so that it is vibrant and not dampened.
If you decide for sand and paint one last time, you can achieve a smooth, even coat with just a little sandpaper and a few drops of topcoat.
The sanding of the first coat of paint brings to light the irregularities and inconsistencies of the roller brush. Use 220 grit sandpaper and attach the paper to the sander conveyor belt and let it run extremely easily over the surface. Do not put pressure on the sander other than the weight itself and do not put pressure on it if it is not weighed down by any other weight.
If the floor is carpet, you should normally be able to start with about half a grain and if not, with about a quarter grain on the surface of the sandpaper.
If you haven't sanded the floor for 30 years and it still has a relatively heavy layer, that's a good starting point. Even when sanding hard wooden floors, a lot of wood material can be removed in a short time. If you are in the middle of a flooring project, such as a kitchen or bathroom, or if the surface has worn out in certain places on the wood, use 24-grit sandpaper.
If you are applying stains, it is probably a good policy to first plywood cutting saw off the snippets before applying the stain
When sanding on a flat surface, use flat blocks to secure the sandpaper and remove the sanded dust using one of three sanding methods. The most efficient way to do this is to use the same sandpaper you used on your last machine sand. If you grind a little longer, you can use one with finer grains, but it is best to use the last one used in the machine to grind it.