Schönox HS Sturdy Repair Patch and Smooth Compound - 33 lb Bag

About

The new Schönox HS Sturdy, rapid-drying, repair and smoothing compound, incorporates hybrid active-dry technology creating a powerful solution with versatility and strengths previously unseen in flooring. From featheredge to 2” depths, HS Sturdy repairs, patches, and smooths combining tasks for use on a wide variety of substrates including concrete and gypsum as well as diverse ones such as wood, vinyl, and ceramic.

Schönox HS Sturdy is suitable for smoothing and leveling of:

Concrete, cement substrates
Floor leveling compounds
Gypsum substrates
Old substrates such as ceramic tiles
Old, water-resistant adhesive residues
Wooden substrates
Stair steps and wall breakouts

Calculator

How many square feet of patching area?
Tip: multiply the length (in feet) by the width (in feet)

Patch depth	33 lb bags
1/16"
1/8"
1/4"
3/8"
1/2"
3/4"
1"
1-1/4"
1-1/2"
1-3/4"
2"

Specs

Pot life: 15 minutes
Ready for foot traffic: 30 minutes
Working temperature: 41ºF - 90ºF
Coverage at featheredge: 600 sq. ft. per unit
Coverage at 1/8" : 100 sq. ft. per unit
Compressive strength: 4400 psi @ 28 days

Technical Data Sheet

Safety Data Sheet

Instructions

Priming

Gypsum substrates (sanded and vacuumed):
- no priming required when used as a true featheredge up to 1/4”
- prime with Schönox KH Fix when used as a repair mortar above 1/4”
Cement substrates such as concrete, prime with Schönox VD (1:3) or KH Fix
Non-porous substrates such as ceramic tiles (thoroughly cleaned and abraded), terrazzo, and water-resistant adhesive residues (removed as far as possible), prime with Schönox SHP
Wooden substrates such as OSB board and plywood (well screwed and/or bonded), prime with Schönox SHP

Mixing Ratio

Mix each 33lb. bag with 3.8 - 4.6 liters / 4 - 5 quarts of water
We recommend to extend Schönox HS Sturdy with dry, clean aggregate (aggregate is added last) at a layer thickness above 1/2“: type and amount of aggregate used will affect product performance. As qualities of locally available aggregates vary, we recommend to perform tests prior to use on a larger scale.
Do not overwater