Preparing the substrate

Taking a surface back before anything new goes on it. Renovation grinders in 80 and 150 mm run interchangeable heads, and choosing the head correctly is most of the job. Diamond HARD, with an 11 mm segment, suits hard substrates like old concrete. Diamond ABRASIVE is for the sand-based materials that would glaze a hard segment — screed, fresh concrete, sand-lime brick, cellular concrete, tile adhesive. THERMO takes on coatings and adhesives that clog an ordinary disc, and PAINT handles old paint systems. Where a diamond head is the wrong tool entirely, the carbide head carries twelve tipped cutters for synthetic resin plaster and elastic adhesive. Brush rings feather the edge of a treated area so the repair doesn't telegraph through the new finish. All of this is dust-heavy work, so extraction here is part of the tool, not an accessory to it.