Python SL Fast Setting Cement Based Self Levelling Compound 20Kg – Pallet Deals & Bulk Buy

Python SL Fast Setting Cement Based Self Levelling Compound extended information

Coverage: 20kg will cover 4.2m2 at 3mm thickness

Preparation

Before starting, all substrates must be clean, dry and strong enough to support the weight of the Python SL, adhesive and the final floor covering being applied. Remove all dust, dirt, oil, grease and other contaminants that may affect adhesion. Where traces of adhesive remain, these must be strong, sound and well adhered to the substrate.

The substrate must be confirmed dry by consistent moisture readings; <75% relative humidity (RH) or <0.5% residual moisture content prior to application. Remove any loose or flaking layers. Laitance should be removed from concrete and sand/cement screed surfaces. Sub-floors directly to earth must have a damp-proof membrane.

Mix by adding Python SL to clean water, approximately 4.2 – 4.8 litres of water to 20kg of Python SL. We suggest starting with 4.2 litres of water which can then be increased to a maximum of 4.8 litres if necessary. Python SL will flow better at 4.8 litres of water, however, do not exceed 4.8 litres of water per bag of Python SL. Exceeding 4.8 litres of water per 20kg will result in water bleed and therefore extended drying times and a weakened mix.

Mixing & Application

Mix ideally with an electric paddle until you obtain a smooth and lump free consistency. When mixed allow to stand for 2 minutes and stir again before application. Once mixed, Python SL will remain workable in the bucket for approximately 30 minutes.

Pour a small quantity onto the prepared surface and trowel down lightly to a depth between 2 – 12mm. The use of a spiked roller is recommended in order to remove entrapped air and smooth out flow lines. Python SL will maintain a “wet edge” for 20 – 30 minutes but depending on the porosity of the substrate and ambient conditions, once applied, the drying process can begin after 15 – 20 minutes.

For depths greater than 12mm, aggregate should be added to Python SL for increased economy and performance. Add 3 – 5mm aggregate at a rate of 2 parts Python SL to 1 part aggregate. Add powder to water and use the water additions stated on the product packaging, please note that the water additions may vary slightly depending on the aggregate used. Pour a small quantity onto the prepared surface and trowel down lightly to a maximum depth of 25mm. If you wish to apply a second coat of Python SL, allow the first coat to dry and prime between applications.

Python SL must be left to dry before applying the final decorative surface flooring. This is typically 8 hours for ceramic, porcelain and natural stone tiles and 48 hours for soft flooring such as linoleum and vinyl. The setting time will depend on atmospheric conditions/ temperatures, it will be slowed by lower temperatures and accelerated by higher temperatures.

N.B. If there is no air flow within site conditions, the drying time may be restricted.

The critical moisture content for the flooring in question must be observed. If in doubt, please call our technical department on 020 8778 9000.

Substrates

• Sand/Cement Screed
• Concrete
• Plywood Overlay (12mm min) (not suitable)
• Chipboard Overlay (18mm min) (not suitable)
• Electric Underfloor Heating (not suitable)
• Water/Wet System Underfloor Heating (not suitable)
• Tile Backer Boards
• Existing Ceramic, Porcelain and Natural Stone Tiles
• Flooring Grade Asphalt & Bitumen (not suitable)
• Anhydrite Screeds (not suitable)
• Fibre Cement Sheet (not suitable)
• T & G Floorboards (not suitable) (not suitable)
• Floating Floors (not suitable)
• Existing Vinyl Tiles (not suitable)
• Steel/Metal Surfaces (not suitable)
• Existing Adhesive Residues  (not suitable)
• Green Screed (not suitable)
• Fibreglass (not suitable)

Python SL technical data

Python SL Substrate Preparation

Concrete: New concrete must be allowed a minimum of 6 weeks drying time. As an approximate guide for drying times, allow 1 day per mm up to an overall depth of 50mm and 2 days per mm for anything above 50mm. Ensure new concrete is confirmed dry via consistent moisture readings across the whole surface. Concrete screeds must have a reading of less than 75% relative humidity (RH) before work can commence. Remove any laitance from the surface mechanically and ensure that mould oil, curing agents and any other contaminants are removed. Remove all dust and dirt ideally by vacuum. Prime the surface with Python PR diluted 3 parts water to 1 part Python PR and allow to dry. Very porous substrates will require more than one coat.

Sand/Cement Screed: New sand/cement screed must be left for a minimum of 4 weeks to dry sufficiently. Ensure new sand/cement screed is confirmed dry via consistent moisture readings across the whole surface. Sand/cement screeds must have a reading of less than 75% relative humidity (RH) before work can commence. Remove any laitance from the surface mechanically and ensure that mould oil, curing agents and any other contaminants are removed. Remove all dust and dirt ideally by vacuum. Prime the surface with Python PR diluted 3 parts water to 1 part Python PR and allow to dry. Very porous substrates will require more than one coat.

Existing Ceramic, Porcelain & Natural Stone Tiles: Ensure the surface is dry and free of any contaminants, loose dust or dirt. Existing tiles that have been previously treated with sealer must be sufficiently cleaned in order to remove any surface treatments. Prime the surface with one coat of Python PR Slurry Mix. The Slurry Mix consists of 1 part water to 1 part Python PR mixed with approximately 30% by weight of cement based tile adhesive or levelling compound to form a brush on slurry. Allow the Slurry Mix to dry before applying Leveller. Alternatively prime the surface with one coat of PR + Grip and allow to dry.

Power Floated Concrete: Ensure the surface has been allowed 7 days to cure. Ensure new concrete is confirmed dry via consistent moisture readings across the whole surface. Concrete screeds must have a reading of less than 75% relative humidity (RH) before work can commence. Power floated concrete can leave a loose top layer and/or laitance once it has cured. Remove the loose top layer and any laitance from the surface mechanically or by acid etching and remove all dust and particles ideally by vacuum. Once all laitance has been removed, prime the surface with one coat of Python PR diluted 3 parts water to 1 part Python PR.