Reel Mower Blade Sharpener Kits: Backlapping Made Simple

The sharpener for a push reel mower is a backlapping kit. It pairs a lapping compound with a hand crank. The kit works right on the reel that is already mounted on the mower.

Backlapping runs the reel backward against the bedknife. Gritty compound wears both edges sharp again as it turns. A typical five blade reel takes twenty to thirty minutes.

There is no grinder, no blade removal, and no shop visit. This guide covers what a reel mower backlapping kit contains. It also covers how backlapping differs from grinding, and when a damaged reel needs a shop instead.

What a Reel Mower Backlapping Kit Contains

A standard kit ships with three things. There is lapping compound, a hand crank, and a small brush for spreading the compound. The crank fits the reel shaft and turns it backward against the bedknife.

The process itself is simple once the kit is in hand. Brush a thin coat of compound across the full width of the reel. Crank slowly in short bursts, checking the edge by feel every few passes.

Most kits fit a wide range of push reel mower brands. Manufacturer kit listings in this category name compatibility across brands. American Lawn Mower, Great States, Earthwise, and Scotts models are common examples.

Kits generally run around $20. That price covers the compound, crank, and brush together. Replacement compound alone costs less once the crank is on hand.

Fiskars is a special case worth naming here. It comes up constantly in owner questions. The brand states its own kit works with a traditional contact model or with a StaySharp reel mower.

The manufacturer frames the StaySharp use case differently, though. It calls out heavy wear over many years, not routine upkeep. That line is built to hone itself against the bedknife during normal mowing, so a kit is more of a rescue tool there.

Our full walkthrough of adjusting bedknife to reel contact covers the setup step first. Get that contact right before you crank anything. It is the step that makes backlapping actually work.

How Backlapping Differs From Grinding

Backlapping hones the existing edge. It does not remove much metal. Grinding resets the cutting angle and removes material to get there.

One is maintenance. The other is a repair. A mildly dull reel from a season of use is a backlapping job.

A reel with a worn or rounded angle needs grinding first. Backlapping keeps it sharp after that grinding is done. Treat backlapping as a weekly habit and grinding as a yearly shop job.

A quick paper test tells you which one you need. Hold a strip of paper against the reel and turn it by hand. A clean, easy cut means backlapping is enough for now.

Choosing the Right Compound Grit

Compound comes in a few grits. Picking the right one matters more than people expect. Coarse compound, around 80 grit, suits a reel with real dullness or light nicks.

Medium compound, around 120 grit, is the one used for routine touch ups. It is the grit most owners reach for most often. Fine compound in the 180 to 220 range exists for polishing an already sharp edge.

That fine range is common on golf course turf equipment. It is rarely needed on a home mower. Most homeowners only ever need 80 and 120 grit compound.

When Backlapping Cannot Fix It

Backlapping has real limits. Knowing them saves wasted effort. A bent reel will not true up no matter how long you crank it.

A reel with big nicks or heavy pitting needs metal removed. Honing alone will not do that. A grooved or wavy pattern across the reel is another warning sign.

That pattern usually comes from running the reel too tight against the bedknife. Too much contact for too long causes it. Only grinding corrects that kind of damage.

For that job, our look at how a professional shop handles a damaged reel is worth reading first. It walks through what the visit involves. It also covers roughly what the work tends to cost.

Mistakes to Avoid When Backlapping

Skipping the bedknife adjustment is the most common mistake. Backlapping only works with light, even contact across the reel. Compound alone will not fix contact that is set wrong.

Our detailed guide to the full sharpening process covers that adjustment step by step. It is worth a read before your first backlapping session.

Using too much compound is another one. A thin, even coat does the job. Excess compound just flings off and wastes product.

Rinse the reel fully once you are done. Leftover grit can grind into the bedknife during mowing. That undoes the work you just finished.

Skipping grit steps is a third mistake. Jumping straight to fine compound on a very dull reel wastes time. Coarse compound was built for that job, not the fine stuff.

Our page on straight blade mower sharpening tools is the better read for a rotary mower. Many households run both types side by side.

FAQ

Do I need a backlapping kit for every reel mower?

Almost always, yes. A contact style reel mower needs periodic backlapping to stay sharp. A kit is the standard tool for that job at home.

How often should I backlap a reel mower?

Most home mowers need it every few weeks during the mowing season. A mower used lightly on a small lawn may only need it once or twice a year.

Can I use a backlapping kit on a Fiskars StaySharp mower?

Yes, according to Fiskars. The manufacturer positions it as a fix for a StaySharp mower that has seen heavy use over many years. It is not meant as routine upkeep on that line.

What grit compound should I start with?

Start with 120 grit for normal touch ups. Switch to 80 grit only if the reel is visibly dull or has light nicks. Finish with 120 grit afterward either way.

How do I know it is time for grinding instead of backlapping?

Watch for a reel that stays dull after several minutes of backlapping. A bent reel, heavy nicks, or a wavy pattern across the blades are also signs. Backlapping cannot fix any of those problems.

Can I backlap without buying a full kit?

You need lapping compound and a way to turn the reel backward. That turning is what the crank in a kit provides. A few owners rig a drill adapter instead, but a basic kit is the simpler start.

For more on keeping outdoor tools sharp, check the lawn and garden section for more guides like this one.