I came back to the hobby during COVID. One thing I hated, and still hate doing is sanding putty.I am just not that good at it. I am always looking for something to help me. The UMM-USA series of sanding bars are one solution to a gritty problem.
The bars come in various sizes; fine, small, medium, large, extra-large and extra-extra-large. I reviewed the Extra-Large version. They come as a six-sided polished aluminum bar, with the ends being pointed.
My initial take on the block was one of curiosity, a large flat good for sanding large flat surfaces, or so I thought; something most aircraft and ship models do not have. I then took a closer look and realized that the angled/pointed ends would be great for small tight surfaces, or if a very narrow area needed to be sanded, which is how I have been using it. Ironically, my son printed a sandbag wall and used the long flat bottom to clean it up.