What type and grit sanding block to use when sanding stairs before painting?
The sanding block on the left is an edge detailing block. It is angled and great for sanding grooves, details, edges and hard to reach places. The sanding block on the right is a dust channeling, clog resistant block I thought would be needed and useful. However, in retrospect, I should have just bought two of the edge detailing angled blocks, because that what I used the most and was very helpful. I mainly just used the other one on the flat, wide areas of the rail.
After some thought, I decided to use 120 grit sanding blocks. What does this mean? Well, if you are a newbie to home improvement, basically the higher the grit, the finer the grains and smoother the finish (with less scratches and damage.) If you choose a lower number grit, it may be too coarse and show fine scratches or grooves after painting.
What is the proper technique for sanding wood stairs?
Start at the top of the railing and then work your way to sides and bottom, giving extra attention to areas that were used the most, (such as the top of hand rails.) These areas were extra dirty and oily from hand traffic and even though the rails were cleaned regularly by me, and even right before with the dish liquid, there were layers of grimy oil coming off the top of rails, gross!
Sand in the direction of the grain where possible, especially on top and sides of rails. What happens if you sand against the grain? If you sand perpendicular against the grain, it may later reveal faint scratch marks when painted with the high gloss paint. Use long, smooth strokes with the grain, on the top and sides for a smooth, even result. For the hard to reach, tight areas, press your angled sanding block into the nooks, crannies, such as between spindles.