How to Strip Failed Paint from Exterior Siding

On the wall they were always one job.

Time: half a day to a full day per wall of typical spot failure; the pace is set by how much paint has let go, not by square footage. A whole-house prep runs to days. A full strip to bare wood is a different project entirely (Step 3 tells you which one you have).

Difficulty: endurance and edge-feel, not fine skill. The learned judgment is knowing where to stop.

Before you start: the law, the water, and the boundary

Date the house before you touch the wall. Built before 1978, it carries lead paint in its older coats until a test kit proves otherwise — and scraping is the exact activity the federal lead rule was written about. For anyone paid to disturb more than 20 square feet of exterior paint on a pre-1978 home, the RRP rule requires an EPA-certified firm with a trained Certified Renovator running containment, lead-safe work practices, and HEPA cleanup — and a siding prep blows through 20 square feet in its first hour (EPA — Lead RRP Program · EPA — RRP for contractors). Homeowners working on their own house are exempt from the certification, not the toxicology: tape sheeting to the foundation and run it well out from the wall, close nearby windows, keep children and pregnant women away, mist the surface as you scrape so chips fall wet instead of dust drifting, and clean up with wet methods, bagging the sheeting at day's end. Federal work practices also prohibit the shortcuts: no open-flame burning or torching, no heat gun above 1,100°F, no power sanding or grinding without HEPA-shrouded capture (EPA — RRP work practices). The 09190 vacuum scraper feeding a HEPA-rated wet/dry vac captures chips and dust right at the blade — the correct direction for this century's version of the job — but no scraper is a compliance device; the containment, the practices, and (on paid work) the certification are.

Find the water before you find the scraper. Exterior paint fails for reasons, and the reasons cluster. Paint peeling to bare wood in sheets on one patch of wall is water: an overflowing gutter above it, a missing kickout flashing, a dryer or bath vent, a sprinkler, shrubs holding the wall damp — or, on old houses, interior moisture driving out through boards that were never back-primed. Autopsy a blister: bare wood inside means a moisture blister (find the source); paint inside means a heat or solvent blister (cosmetic). Rub a palm across dull, faded paint — chalky powder is a washing-and-priming problem, not a scraping one. Scrape without fixing the water and you have booked this same weekend again in two years.

Sound the boundary and size the job honestly. Probe the wall with a scraper corner: sound paint stays put under firm pressure; failed paint lifts, crackles, or slides. Walk every elevation and map it — failure lives where water sits and sun beats: butt edges, drip caps, sill noses, end grain at corner boards and butt joints, south-facing fields. Spot and edge failure — the common case — is this guide. If *most* of a wall has failed, or alligatored build (old paint crazed into scales like a dry riverbed) covers whole faces, understand what scrape-to-sound will give you: a sound but topographic surface. That is honest and paintable. If you need furniture-flat, that is a full strip — heat or chemical work with equipment this store doesn't carry — and on a pre-1978 house it belongs with the certified trade.

Set up for the mess you are about to make. Sheeting down first. Work top-down so chips don't rain over finished boards. Pick a dry stretch — you'll want drying days after the wash in Step 10. Gables and high walls want staging rather than a stretch from a ladder top: pull-scraping is a two-hands-on-the-wall activity (the pole chisels 12070/12072 can break blisters at reach, but they can't do the pull work for you).

The removal

Break the heavy failures push-style. Blisters, curled sheets, and alligatored scale first, with the 12060 bent chisel: get the edge under the failure and drive with the grain, popping paint off at the bond line. The 20° bend holds the blade at attack angle while your wrist stays neutral and your knuckles stay off the siding; the 12000 does the same one-handed in tight quarters, trading reach for pocket leverage. You are excavating *paint* — the instant the edge bites wood fiber, drop the angle and ease off. This pass exists because a pull scraper is a plane, not a pick: dragged over heavy scale it skates and chatters. Push to excavate, pull to plane — the sequence is the whole trick.

Pull-scrape the field to the sound boundary. The 10540 is the workhorse: head flat to the work, one hand on the grip and one on the knob directly over the edge — doubling controllable downforce without doubling fatigue — drawn along the grain in overlapping strokes. The right feel is chips and ribbons rolling off ahead of a trailing edge that *cannot* dig in; that is why the pull scraper, not the putty knife, owns exterior prep. Boundary discipline: failed paint releases with a crack; when the blade stops lifting and starts burnishing, you have reached sound paint — stop and move over, the feathering in Step 10 owns the transition. Rotate the 4-edge blade as it dulls: two rough edges hog heavy build, two smooth edges finish. Steel dulls in minutes on old paint and files back in thirty seconds — the working rhythm is scrape, file, scrape. On widespread failure or iron-hard old coatings, the 10620 carbide holds its edge across jobs rather than passes; no file touches carbide — rotate, then replace — and never pry with it, because carbide's hardness is paid for in brittleness.

Match the head to the board, and chase the water lines. Most lapped siding shows four to six inches of face: a 2-1/2" head rides that face without its corners catching the butt above or the shadow line below — and on cupped boards, narrower bites keep the full edge loaded. The 10550's 5" edge divides the same downforce across twice the width; save it for broad, flat, heavily failed runs — corner boards, water table, frieze, fascia, flush panels — where it clears field fast, and keep it off narrow faces and anything curved. The one-hand 10520 suits casing faces and short sessions. Then work the places failure starts: pull along each butt edge, tip the head so edge rather than corner meets drip caps and sill noses, and expect end grain to give up its paint easily — it drank the water that killed it. Window muntins and sash channels are their own narrow-head guide; leave them for that day.

Reset what you find. Scraping finds every popped siding nail on the wall. Set them as you go with the Hammer Head® on the 10540/10550/10620 — that steel boss exists so a scrape day doesn't include carrying a hammer up the ladder. Rusty heads get wire-brushed bright in the next step and primed with everything else.

Wire-brush the feathered edges, profiles, and grain. The pull scraper leaves two kinds of debris behind: ragged feathered borders around every scraped zone, and islands in the grain valleys and profile curves a flat blade bridges. This is brush work. The 46830 long-nose scratch brush takes directed strokes *with* the grain along board faces and trim runs; the 46837 block drives downward force across open flat fields, tapered nose into the edges; the narrow 46802 gets into casing-to-siding joints and under sill noses; the 46805 brings the widest block plus a scraper nose that pops the crusted spots bristles won't lift. Technique is the whole product: a wire brush cuts on its tips — moderate pressure, long strokes, let the points work. Leaning folds the wire sideways so it wipes instead of cuts and permanently sets the fill; if you're leaning, the spot needs the scraper again, not more force. Softwood furs if over-brushed — light passes, and stop while the surface is still wood rather than fuzz. Where the job touches steel — drip edges, railings, hardware — the same carbon brushes apply, with one rule: prime brushed metal the same day, before flash rust restarts the clock. And one hard boundary: never carbon wire on aluminum siding or trim. Carbon bristles leave iron in the surface that blooms rust and stains galvanically; the dedicated stainless siblings (46831/46838) exist for exactly that metal — though in truth chalky aluminum wants washing and priming, not stripping.

Feather, wash, and dry. Hand-sand every transition from paint to wood — 80 grit to knock the ledges down, 120 to blend — until a flat palm can't find the step; an edge you can feel telegraphs through two finish coats. On presumed-lead work, feather by hand and work damp; dry power sanding is exactly the prohibited dust engine from Step 1. (Abrasives live on this store's sanding wall — this catalog's scrapers and brushes carry you to the sanding step, not through it.) Then wash the wall — detergent or TSP-substitute, a mildew-killing wash where the shady face has gone green — rinse, and give the wood dry days before primer. Paint over damp wood is how the next failure gets scheduled.

Spot-prime promptly — days, not weeks. Sunlight starts degrading bare wood's surface fibers immediately, and primer grips weathered wood poorly; prime every bare spot and every feathered border inside the week. Oil or alkyd spot primer goes on with a chip brush — 80153 (2") for spots, 80152 (1") for edges — the sacrificial natural-bristle applicator whose whole doctrine is *touching oil primer into weathered spots and throwing the brush away without guilt*. Latex primer flares natural bristle, so its budget applicator is the polyester utility pair (80002 for spots, 80005 for whole boards). After primer, caulk the open joints — casings, corner boards, butt-to-casing gaps — and then the repaint itself, which is its own guide (brush, roller, and back-brushing doctrine live there).

Close the site like you opened it. Chips don't rot — get them all. On lead-assumption work: fold sheeting inward, bag it, HEPA-vac and wet-wipe adjacent hard surfaces, and launder work clothes separately. On any job: a magnet sweep of the drip line finds the nails you reset that didn't hold.

What goes wrong (and the fix)

"The pull scraper skates and chatters over the thick stuff." Alligatored build needs the chisel break pass first. Push to excavate, pull to plane — the order is not optional.

"I'm gouging the boards." A dull blade makes you substitute force for edge, and force arrives at the corners. File the steel (or rotate the carbide), lower your downforce, and keep the whole edge loaded instead of a corner.

"The edge never stops lifting — I'm stripping the wall an inch at a time." You're chasing the edge. If a firm corner-probe won't lift it, it stays; feather and primer own the transition. If truly everything lifts, re-read Step 3: that's a full-strip wall, and pretending otherwise costs a season.

"The wire brush is making the wood fuzzy." Too much pressure or across the grain. Tips only, with the grain, fewer passes — fuzz telegraphs through paint the same way a ledge does.

"The carbide blade chipped." It got levered or struck. Chisels pry; pull heads plane. Brittleness is the tax on carbide's edge life.

"It looked perfect, and the paint peeled again the next summer." You scraped the symptom. The gutter still overflows, the chalk never got washed, or bare wood weathered a month before primer. The wall keeps score, and it only counts what you fixed.

The history footnote (because these pages should be worth reading)

For roughly two centuries the professional cure for failed exterior paint was fire: painters softened old oil coats with burn-off lamps and torches and sheared them away with stripping knives — fast, effective, and the origin of a long ledger of burned houses and poisoned tradesmen. The 1978 residential lead-paint ban and the RRP era ended it: open-flame burning is now federally prohibited on pre-1978 homes, and the >1,100°F heat gun went with it (EPA — RRP work practices). The pull scraper is the trade's quieter, older answer — an anonymous bench pattern with no inventor to name, refined across generations — and Hyde has been grinding such edges in Southbridge, Massachusetts since Isaac Hyde's carriage house in 1875 (Hyde Tools — Our Story).

Every linked PDP lists this guide under its applications — the graph runs both directions.