Bosch PSM 100 A Review

Sanding is rarely the most exciting part of a DIY project, but it is often the step that determines whether the finished result looks professional or slapdash. Sanding by hand with a simple block and paper works — until you face a large flat surface, a detailed profile, or the need to reach into a tight corner where your fingers simply will not fit. A multi-sander — sometimes called a detail or delta sander — bridges the gap between coarse hand-sanding and a full-sized orbital machine. Its compact triangular front tip reaches into corners and along edges, while the larger rear surface covers flat areas efficiently. For anyone painting furniture, refinishing wooden window frames, or preparing walls and skirting boards for a fresh coat, a good multi-sander saves hours of tedious hand labour and produces a surface that paint and varnish will bond to beautifully. It is the quiet workhorse that earns its keep on every project, from quick touch-ups to full-room makeovers.

Multi-sanders — also known as delta or detail sanders — are designed to handle the sanding tasks that larger orbital or belt sanders cannot manage: corners, edges, narrow profiles, and intricate surfaces. Bosch, with its green Home and Garden range aimed at DIY users, has long been a go-to brand for reliable, well-engineered sanding tools. The PSM 100 A is one of their most popular models, combining a 100-watt motor with an integrated microfilter dust extraction system and a clever split sanding plate that maximises abrasive usage. This kit also includes 25 pre-cut abrasive sheets spanning four grit grades, making it ready to use straight out of the box.

In this review, we test the PSM 100 A on a range of common DIY sanding tasks — stripping painted woodwork, smoothing filler on walls, finishing furniture, and tackling those awkward corners where only a delta tip will reach. We look at dust collection efficiency, ease of paper changes, vibration levels, and overall value compared to competing multi-sanders. By the end, you will know whether this Bosch sander is the right finishing tool for your home workshop.

The PSM 100 A is a corded electric multi-sander powered by a 100-watt motor that drives an oscillating sanding plate — the pad vibrates rapidly back and forth rather than orbiting, producing a fine, consistent scratch pattern ideal for finish sanding. The sanding plate measures approximately 92 mm × 184 mm with a distinctive triangular delta tip at the front, giving the tool its characteristic shape. This design allows the user to sand right into corners and along edges where a rectangular pad would leave an unsanded margin. The plate operates via a hook-and-loop (Velcro) attachment system, making abrasive sheet changes a matter of seconds — peel off the old, press on the new.

Two design features set the PSM 100 A apart from basic multi-sanders. First, the split sanding plate: the triangular delta tip can be detached from the main rectangular body and repositioned, effectively giving you two fresh sanding edges from a single sheet. When the tip of the abrasive wears down — as it always does first — you can rotate the delta section to use a sharp edge while the main body of the paper is still good. Second, the integrated microfilter dust extraction system draws sanding dust through perforations in the pad and sheet, collecting it in a transparent microfilter box mounted on the tool. This keeps the work area cleaner and extends abrasive life by preventing clogging.

In everyday use, the PSM 100 A feels balanced and comfortable. The compact body fits naturally in one hand, and the soft-grip surfaces reduce vibration transfer to the user's fingers during extended sanding. The oscillating action produces a fine finish with minimal risk of gouging — this is a finishing sander, not a stock-removal tool, so it excels at smoothing prepared surfaces rather than stripping heavy paint or varnish. The delta tip is genuinely useful for reaching into corners of window frames, the insides of cabinet doors, and the junction between stair treads and risers — places where a standard orbital sander simply cannot go.

The kit includes 25 pre-cut abrasive sheets in four grit grades: 40, 80, 120, and 180 — covering the full range from aggressive paint stripping to fine surface preparation. The sheets have pre-punched holes that align with the sander's dust extraction ports, so there is no need to manually punch holes before use. The microfilter box is transparent, making it easy to see when it needs emptying, and it clips on and off without tools. Note that the PSM 100 A does not have a connection for external vacuum extraction — the microfilter box is the only dust management option, which limits its effectiveness during very heavy sanding sessions.

The sander weighs approximately 1.4 kg and measures roughly 250 mm in length — light and compact enough for one-handed use on vertical surfaces and overhead work. The product holds a 4.5 out of 5 stars rating from 58 customer reviews and ranks at #5,639 in the broader DIY and Tools category — strong numbers that reflect Bosch's reputation for quality in the DIY segment. Bosch Home and Garden provides standard manufacturer warranty coverage, and spare parts including replacement sanding plates, microfilter boxes, and carbon brushes are widely available through Bosch's service network and online retailers.

Best suited for DIY homeowners and hobbyist woodworkers who need a versatile finishing sander for paint preparation, furniture refinishing, and detail work in corners and edges where larger sanders cannot reach.