Vison Patch RS

Product Name: VISON PATCH RS


Manufacturer: Vison Tech Products LLC


Product Description

VISON PATCH RS is a professional grade, easy spread, trowelable underlayment formula. The specialized rapid setting patch is ideal for surface restoration, filling depressed or uneven substrates. Use VISON PATCH RS to fill or raise the old floor surface to a flat and smooth surface prior to installing ceramic tile, natural stone, resilient flooring, carpet, wood, and other floor coverings. VISON PATCH RS is applied in spot areas or in the entire room to an application thickness of 0” to 1/2" (0-13mm). Use VISON PATCH RS to re-smooth scarred, sloped, uneven or depressed substrates back to level. Upon placement of the underlayment patch, it will rapidly set and cure to allow light traffic on the surface within 4-6 hours. VISON PATCH RS is also ideal for interior/exterior use beneath the carpet, vinyl, hardwood flooring, ceramic tile, and natural stone installations.




TEXTURE: Powder consisting of Portland cement, polymer additives, mineral filler, organic and inorganic chemicals.

PACKAGING: 25 lbs. (11.3 kg) Multi-wall bags.


Basic Use

VISON PATCH RS is used for floor surface correction, surface filling of uneven, tilted, or wavy substrates.


Key Benefits and Features

Rapid setting underlayment, easy spread, resurfacer, and a leveler of various substrates. Smoothes surfaces for all types of floor finishes. Floor areas can be corrected and patched with minimal downtime and fast cure properties.



This product is not recommended for use over floor surfaces prone to flexing, vibration, or movement. Do not apply over gypsum-based surfaces, hardwood, particle board, parquet, strip wood floors, OSB board, lauan plywood, cushion or sponge-back vinyl flooring, metal, fiberglass, plastic or rubber. Not to be applied over painted, over-spray, old adhesives, curing compounds waxes, oils, sealers or over unclean, loose or crumbling surfaces. Not recommended as a wear surface. Underlayment should be moisture tested to levels compatible with the hardwood, vinyl, rubber, and carpet manufacturer's recommended levels before covering. For product installations, the temperature of the area to be leveled must remain above 50°F (10°C) for 72 hours.


Applicable Standards

There is no industry code standard established for this product.


General Surface Prep

All surfaces must be dry, and structurally sound. Remove all grease, oil, dirt, curing compounds, sealers, adhesives, or any other contaminant that would prevent a good bond. Glossy or painted surfaces must be sanded, and stripped of all contaminants. Concrete must be free of efflorescence and not subject to hydrostatic pressure. Concrete slabs should have a coarse finish to enhance the bond. Plywood flooring including those under resilient flooring must be structurally sound and meet all ANSI and deflection requirements. Ambient temperature should be maintained above 50° F (10° C) or below 100° F (38° C) for 72 hours to achieve a proper bond.


Cementitious Substrates

Concrete must be fully cured and must accept water penetration. Contaminants should be mechanically removed before installation. The use of an optional latex admixture liquid as a primer for porous/dry, rough, or exterior surfaces will enhance the bond. Allow the primer coat to dry clear to touch prior to troweling the product. If primer dries longer than 12 hours before underlayment placement it will be necessary to re-prime the surface.


Wood Substrates

All substrates shall be rigid and non-flexing for live and dead loads. Floor structure and construction shall be conforming surfaces, interior application, properly gapped, glued, and screwed. Optional brush or roll surface with VISON M4 Latex Admixture as a primer for added adhesion. After brushing the primer to the surface, allow the primer coat to dry clear to touch before applying the patch. Use corrosion-resistant staples and attach ¼” (6mm) galvanized, expanded metal lath or corrosion-resistant plastic lath to the plywood before applying VISON PATCH RS on applications greater than 1/4" full screed floor areas. For questions about proper subfloor installation, call VISON Technical department.


Old Adhesive “Cut-Back” Residue

Old adhesive residue must be thoroughly hard and tightly bonded to the surface. Remove and scrape ridges and all loose materials. Do not sand or grind old adhesive unless proper methods to prevent harmful dust generation. Follow recommendation on the Removal of Resilient Floor Coverings. Mix VISON PATCH RS with Latex Admixture Liquid in place of water when patching over these surfaces.


Expansion Joints

Install expansion joints around all perimeters or restraining surfaces where possible to allow for expansion movement. Expansion joints and cold joints, as described in ANSI A108.01, should never be bridged with setting material. They must be brought through the tile work and filled with an appropriate elastomeric sealant (100% Silicone). Contact Vison Tech’s Technical Services for the proper treatment of control or saw-cut joints. Refer to TCNA Handbook EJ171.



All surfaces should be brushed or dampened with clean water or VISON M4 Latex Admixture before VISON PATCH RS application. The clean water sponge dampening is essential if the surface is dry, porous, and/or hot.  Latex liquid priming can be more effective on these types of substrates prior to application.



For best results, maintain all materials, substrates, room, and adhesives at 50°-70°F (10-21°C) for 24 hours before and 72 hours after installation. In a clean container, add 25 lbs. (11.3 kg) VISON PATCH RS to approximately 2.5 quarts (2.3 l) of clean, cool water. Blend VISON PATCH RS powder and water to a soft, trowelable, paste consistency. Do not over-water or mix the patch to a fluid or pourable mix. Excess water addition or overly fluid consistency causes bond loss, softness, cracking, peeling, uneven surface discoloration, and will void the product warranty. Mix material to a lump-free, uniform, and non-flowable mix.



VISON PATCH RS should be applied to the surface with a flat edge tool and a scraping motion to force patch into the bond surface. Then additional material can be applied and built up to a 1/2 " (13mm) layer. For an application layer greater than 1/2”, the underlayment can be modified with additional dry, clean 1/8”-1/4” gravel or aggregate, at a rate of 8-10 lbs per bag. The additional gravel mix will allow patching up to 1” (25mm).



Per 25 lbs. (11.3 kg) bag covers:

at 1/8” layer = 25 sq. ft. (2.3 m2)


Working Time

Approximately 0-30 minutes, depending on ambient temperature.



Clean tools, hands, and excess materials from the face of the tile, while the mortar is still fresh, with warm soapy water.


Curing and Grouting

Ceramic tile and stone may be installed or set when the underlayment is firmly in place, typically 4 to 14 hours after installation is completed. Carpet, resilient flooring, and wood floor products will be checked by moisture meter to be within levels stated by those floor covering manufacturers' recommendations. Cold temperatures or high humidity may extend curing time.