Narrow work — piers, runs between casings, above backsplashes — where 4 inches overhangs the lane onto dry paper; that is the 3-1/4" 33100's assignment.
Finish borders — the final inches at trim, inside corners, and outlet boxes belong to the 2" stiff putty knife, per the strip guide's division of labor.
Dry stripping — no soak, no shaver; a fresh carbon edge on dry drywall face is a wall repair generator.
Perforation — it cannot put water behind a vinyl face; the 33210 exists for exactly that, upstream.
And it is not a heavy demolition scraper — floor mastic, thinset, and exterior paint fields belong to other blade classes in other lines.
change blades with the head at rest, never mid-carry; the button is a bench control, not a trigger. Two clicks, then stroke: seat the blade until the double lock engages fully — a half-seated blade chatters like a dull one and lies about the cause. Let the head lean: the claimed leverage geometry means the tool works at its own attack; steepening your wrists to muscle a dry patch is how walls get gouged — answer resistance with water. Overlap everything: lane gaps hide under wet sheen and surface later as paste stripes under primer. Wet work, dry storage: carbon blades forgive everything except being put away wet.
Asked before buying
BUYER QUESTIONS, ANSWERED BEFORE YOU ORDER
Is the blade change really tool-free?
Yes — claimed in the catalog row: push-button change, no tools, with a double lock holding the blade positively.
Does it take the same blades as the 33110?
Yes — the 33170 4" 5-pack serves both 4" heads (store-title fitment). The 3-1/4" 33150 pack does not fit this head.
Will the blades rust?
They're claimed carbon steel — so yes, if stored wet. Wipe blades dry after wet work; change freely regardless, they're consumables.
What does "flip the blade" do?
Reverses the blade to the glass-scraping orientation — this model's claimed technique for taking paint and stickers off glass and mirrors with the head's leverage behind a flat-riding edge.
How long is the tool?
Not claimed anywhere in the record — and this corpus doesn't infer it from the metal-handled siblings.
Is it faster at blade changes than the metal shavers?
Unanswerable from the record: their mechanism is simply undescribed . What's claimable is that this one needs no tools, by its own row.
Plastic handle — is that a downgrade?
It's a different bet: the metal pair sells shaft durability, this one sells the mechanism. The record ranks neither, and the head does identical work.
