DIRECTIONS FOR USE

SILASEC is a concentrated liquid waterproofing compound designed to be used with Portland type A or type GP cements to form a permanent waterproof barrier on masonry and concrete structures and floors.

When used as specified, SILASEC can be used as

A WATERPROOF CEMENT PAINTAN ADDITIVE FOR RENDERS AND TOPPINGSA QUICK SETTING PUTTY FOR SEALING AGAINST WATER BURSTS IN PIPES AND TANKS ETC.

SURFACE PREPARATION1. Do not attempt to waterproof an unsound surface.
2. All surfaces must be clean.3. Surfaces should be free of contaminants such as oil, grease, paints, silicones, curing compounds or any material that will effect adhesion.
4. Smooth cement or concrete should be sparrow picked or acid etched to provide a good mechanical "key"
5. When acids or detergents are used during the preparation procedure, care must be taken to pre-wet the surface and ensure all residues from these materials are removed and/or neutralised.
6. To successfully apply SILASEC, the surface must be first saturated with water to take up the surface porosity.

COVERAGEVaries depending upon surface porosity and texture. The following estimates will provide a useful guide.Waterproof Cement paint 30m2 per litre of SILASEC when mixed 1 ltr SILASEC -5 ltr water-7 ltr fresh Portland Type GP cement powder or better quality.Additive to render 1.5 m2 - 12mm thick per litre of SILASEC when mixed 1ltr SILASEC- 5 ltr water into 75kg sand & 25kg fresh Portland type A or Type GP cement.
Additive to concrete 16 litres SILASEC per 1m3 of concrete.

CLEAN UP1. Do not allow used material to set on tools or mixing containers.
2. Wash all equipment in soapy water immediately after use.
DRYING & RECOAT TIMES

As an admix initial setting time for 4:2:1 concrete is reduced from 21/2 hours to approximately 45 minutes.
• Cement paint only
• Touch dry 30-40 minutes
• Hard dry 24 hours
• Wind, temperature and humidity will effect these drying times and care should be taken to allow for this.

Apply SILASEC cement paint in thin coats - Do not apply too heavily as surface may become powdery or may craze or develop mud cracking.In hot weather, apply during the cool hours of the day.When handing SILASEC and/or cement, we recommend that rubber gloves and eye protection be worn.Always use only Portland type A or Type GP cement. Off white cement may also be used depending upon preference.Only mix what you can use within 30 minutes. Hot dry weather will shorten this time, while cool, humid weather will extend it slightly.Ensure SILASEC is stirred and mixed thoroughly before proceeding.Do not use lime in Silasec mixes.Keep SILASEC well stirred when adding to cement mixes.
• Do not over mix.
• Allow at least 4 weeks before applying any decorative paint finish or floor coverings over treated surfaces.

A) ABOVE GROUND LEVELStep 1: Prepare the surface as per surface preparation (Page 2).Step 2: If surface is leaking or weeping water, refer to specification "Sealing Weeping Surfaces Prior to Cement Rendering" (Page 6).Step 3: Saturate the surface with water. Surface must be soaked but not running wet before applying mix. Repeated wetting may be necessary to maintain a saturated surface.Step 4: Mix 1 part by volume of SILASEC with 5 parts of water and stir well. Add 7 parts of Portland type A or type GP cement and mix thoroughly to form a paint then add 1 part of BONDCRETE to paint mix and mix well for the first coat only. Pot life of this mix is approximately 30 minutes.Step 5 : Apply mixed SILASEC cement paint to the surface with a large paint brush or broom, working it well into the surface.Step 6 : Apply a conventional render while the paint coat is still wet and finish off with a wooden float. Allow 24 hours for render to set slightly. Steps 3, 4 and 5 are then repeated at 24 hour intervals until 3 coats have been applied.

B) BELOW GROUND LEVEL
Step 1: Prepare the surface as per surface preparation (Page 2).
Step 2: If surface is leaking or weeping water, refer to specification "Sealing Weeping Surface Prior to Cement Rendering" (Page 6).

Step 3: Saturate the surface with water. Surface must be soaked but not running wet before applying mix. Repeated wetting may be necessary to maintain a saturated surface.

Step 4: Mix 1 part by volume of SILASEC with 5 parts of water and stir well.Add 7 parts of Portland type A or type GP cement and mix thoroughly to form a paint then add 1 part of BONCRETE to paint mix and mix well for the first coat only. Pot life of this mix is approximately 30 minutes.Step 5: Apply mixed SILASEC Cement paint to the surface with a large paint brush or broom, working it well into the surface.Step 6: Apply a "splash" or "dash" coat to the wet paint. A suggested mix for this is 2 parts 5mm metal screening to 1 part Portland type A or type GP cement. Allow 24 hours to dry. Saturate surface and repeat steps 3, 4 and 5. While paint is still wet, apply render. Suggested render mix is 2 or 3 parts clean, sharp sand to 1 part Portland type A or type GP cement mixed to a workable consistency using a dilution of 1 part SILASEC to 5 parts water.

NOTE: As cement tends to settle in water, repeated stirring of the paint mixture is recommended.Do not use lime in this render as lime absorbs water and negates some of the waterproofing characteristics. 
Use BONDCRETE for improved workability and increased adhesion. Typically add 1 part of BONDCRETE to water and Silasec Admixture. Renders containing SILASEC will set faster than conventional renders and care must be taken to allow for this.

WATERPROOFING FISH PONDS & POOLS

To a sound surface, where cracks may exist, follow the repair procedure as detailed below.Step 1: Dig out the crack with a hammer and chisel forming a "V" along the length of the crack. Minimum "V" size should be 18mm to 20mm deep by 18mm to 20mm wide.Step 2: Vacuum out any dust and debris.Step 3: Run a 4mm bead of silicone rubber along the bottom of the "V" section to give a good Flexible seal. Allow to cure as per manufacturers directions.Step 4: Patch area with a mixture of 3 parts sand to 1 part of Portland type A or type GP cement incorporating diluted BONDCRETE ( 1 part BONDCRETE to 5 parts water) instead of the normal mixing water. Allow 24 hours to cure before proceeding.NOTE: To waterproof the walls and floor: follow specification for
"Waterproofing Existing Concrete or Cement Render" (Page 5).IMPORTANT: For fish ponds, it will be necessary to neutralize the lime alkaline action of the cement in water; as that can be harmful to fish. A method of neutralising is as follows:Step 1: Fill pond with fresh water.Step 2: Allow to stand for 4 to 5 days.Step 3: Empty pond.Step 4: Refill with fresh water. Allow to stand for 2 to 3 days.Step 5: Check P. H of water with litmus paper or a pool test kit. Fish are generally happy with a PH. of between 7 and 7.5. To obtain the correct P.H .level, treat as necessary. 

WATERPROOFING EXISTING CONCRETE OR CEMENT RENDERStep 1: Prepare surface as per surface preparation (Page 2).Step 2: Saturate the surface with water. Surface must be soaked but not running wet before applying mix. Repeated wetting may be necessary to maintain a saturated surface.Step 3: Mix 1 part by volume of SILASEC with 5 parts of water and stir well. Add 7 parts of Portland type A or type GP cement and mix thoroughly to form a SILASEC cement paint then add 1 part of BONDCRETE to the paint mix and mix well for the first coat only. Pot life of SILASEC cement paint is approximately 30 minutes.Step 4: Apply mixed Silalec Cement paint to the saturated surface with a large paint brush or broom, working it well into the surface.Step 5: During warm weather, it is advisable to lightly wet the treated surface 6 to 8 hours after paint application to assist in achieving the correct set.Step 6: Steps 2 to 5 are repeated at 24 hour intervals until 3 coats have been applied.NOTE: As cement tends to settle in water, repeated stirring of the paint mixture is recommended.

WATERPROOF TILE GROUT FOR SHOWERS etc. Step 1: Prepare surface (Page 2). Old or damaged grout should be raked out to a depth of 4mm. 
Try using an old hacksaw blade to rake out old grout.Step 2: Vacuum out any dust or particles.Step 3: Prepare your new grout as follows: 1 part BONDCRETE, 5 parts water, 1 part SILASEC. 
Stir this mixture well and add white cement to form a thick, creamy paste.Step 4: Wearing a rubber glove, rub this mixture all over the tiles and into the joints.
Work only in small areas at a time, making sure the joints are filled and all traces of grout material are removed from the tile surface with a soft DRY cloth before progressing to the next section. 

WATER PROOF, QUICK SET, CEMENT REPAIR PUTTYThis system is suitable for stopping flowing water from fractures, holes and bursts caused by water pressure in cement and clay pipes, tunnels, brickwork and concrete structures.Reaction times will vary depending upon air temperature, brand and freshness of cement. Repair is instant and waterproof.Step 1: Prepare surface by opening up damaged sections to allow sufficient area and depth for putty to gain adhesion. Remove any crumbling material with a wire brush.Step 2: Mix one cup of well stirred SILASEC and two cups of Portland type A or GP Cement. 
Mix thoroughly with gloved hand until material is wet and putty like. 
Remove Mix from container and knead in hands.Step 3: When mix becomes hot and while it is still soft plug hole by pushing into hole and holding until hard. For large repairs, steps 2 and 3 may need to be repeated.
Step 4: If weeping water is occurring treat as per below.NOTE: Never mix more than you can hold in your hand. A trial is recommended before actual application to familiarise yourself with the reaction times and procedure.

SEALING WEEPING SURFACES PRIOR TO CEMENT RENDERING Step 1: Prepare surface. Wire brushing may be necessary to obtain best results.Step 2: Ensure surface is saturated with water.Step 3: Mix 1 part by volume of SILASEC with 5 parts of water and stir well. Add 7 parts of Portland type a or type GP cement and mix is approximately 30 minutes.NOTE: Only mix sufficient material for one coat.SEALING WEEPING SURFACES PRIOR TO CEMENT RENDERING continued.Step 4: Apply mixed Silasec cement paint to the saturated surface with a large paint brush or broom, working it well into the surface. Weeping may continue during and after application but this is normal.Step 5: Step 2, 3 and4 are repeated at 24 hour intervals until 3 coats have been applied.Step 6: Apply a "dry mix" to the third coat while it is still wet. This "dry mix" should consist of 1 part sand to 2 parts Portland type A or type GP cement. Wearing rubber gloves, rub this mix into and over the wet paint without leaving a surplus and without removing the paint coating. Step 7: With the weeping now stopped, the wall can now be cement rendered using specification "Waterproof Rendering of Walls" (Page 4).

WATERPROOF ADDITIVEStep 1: Mix 1 part by volume of SILASEC with 5 parts of water and mix thoroughly.Step 2: Use this dilution as your gauging water for your render, topping or concrete.NOTE: SILASEC will accelerate the setting of cement and care must be taken to allow for this.
Issued January 1998.
Replaces & supersedes all previous issues.From: LSAB Issue Date: January 1998. Revision 1The information contained in this leaflet is given in good faith and is intended to be of assistance to users. The wide variety of surfaces and application procedures make it impossible for us to assume any responsibility for the results obtained.