Epoxy grout — thermoset resin, beyond hand abrasion; rent the oscillating tool.
Caulk lines and movement joints — knife work, recaulking trade.
Cutting or trimming tile — every cutting tool in the line does that; this one works between tiles, never through them.
Widening joints for style — a saw that touches arris is damaging, not designing.
And it is not the powered rung: a whole tiled floor's removal at production pace is the Regrout Tool's class of work (whose tips the store stocks as 19502; the tool itself is not in the corpus) or a rented oscillating tool with a grout blade — the honest escalation path is named, not papered over.
strokes cut, pressure wanders. Short strokes to establish, longer strokes to extend, and the blade's own grit doing the arithmetic. Groove first, depth second: a shallow groove the full length of a joint, then deepening passes, beats full-depth inch-by-inch — the groove keeps the blade steered on every later pass. Hands behind the work: whatever the mount turns out to be ⚑(offset per retail, unverified), the habit is a grip that keeps knuckles above the tile plane and fingers out of the stroke path. When cutting slows, the answer is a blade, not force — the 19403 pack exists for exactly that moment, and pressing a spent blade harder is how arrises get chipped. Light on verticals' stroke-ends: the skate-out at the bottom of wall strokes is where most glaze damage happens; shorten the stroke before the joint's end and finish the last inch with deliberate short passes.
Asked before buying
BUYER QUESTIONS, ANSWERED BEFORE YOU ORDER
How deep do I cut the old grout out?
About two-thirds of the joint's depth, centered — enough for the new grout to have real body and raw walls to key into, without chasing crumbs at the bottom. Exception: a cracked tile's perimeter gets cut to full depth before break-out (2c).
Can I just grout over the old grout?
No — the repair everyone tries and the joint everyone re-repairs. A surface skim has no cross-section (it cracks) and old dense grout offers no key (it sheds). Removal first is the entire trade.
Will it remove epoxy grout?
No. Epoxy is a thermoset resin and defeats hand abrasion by design — that removal is oscillating-tool territory beyond this line. Probe an unknown joint before committing the afternoon.
How do I avoid chipping the tile edges?
Centered cut, light pressure, short strokes, intersections last, fresh blades. Nearly all arris damage is a spent blade pressed harder or a stroke skating out of a vertical joint's end.
What's actually on the cutting end of this saw?
Retail listings and Hyde's site describe a carbide-grit blade with a toothed clearing partner — none of it verified into this corpus yet, so this page describes the class and flags the configuration. The technique above holds either way.
Is there a powered version?
Yes — the HYDE Regrout Tool, whose replacement tips the store stocks as the 19502. The tool itself is not in this store's corpus, which is why this saw is the line's from-zero answer.
Do I need a respirator for a few joints?
For a few, ventilation and damp work cover you; for a session, wear the N95 — cumulative dust from a full room is the real exposure, and 2d is the honest math.
