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UltraTile Fix ProRapid RS Flexible Tile Adhesive

UltraTile Fix ProRapid RS Flexible Tile Adhesive

We are currently out of stock on that item.

RRP: £46.99

Our Price: £15.99 inc VAT

Product Details

Product Details

Covers 5m2 when installing insulation boards.

Covers 2.5m2 per bag over underfloor heating.

ProRapid RS is a rapid set, polymer modified, premium grade cementitious tile adhesive, ideal for natural stone, porcelain and ceramic tiles where exceptional bond and rapid set are essential. It is suitable for both wet and dry conditions and is formulated to adhere to most common substrates including screwed and fixed over-boarded wooden floors.

Classified C2FT.

20kg bags.

Features & Benefits

  • Ultra ProRapid RS is a rapid set, high strength, wall & floor tile adhesive.
  • Suitable for heavily trafficked areas.


Rapid Set Installation Manual

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    Ultra ProRapid RS is a rapid set, polymer modified, premium grade cementitious tile adhesive for both interior and exterior use. It is ideal for natural stone, porcelain and ceramic tiles where exceptional bond and rapid set are essential.

    The product is suitable for both wet and dry conditions and is formulated to adhere to most common substrates including screwed and fixed over-boarded wooden floors. Ultra ProRapid RS conforms to the requirements of EN 12004 Class C2F and is available in grey and white.


    Ensure that the tiling surface is clean, dry and firm. It should be free of dust, dirt, oil, grease or any other contaminants. Please ensure that the surface is strong enough to support the weight of the tile and adhesive. To encourage best adhesion to your substrate when applying adhesive to porous surfaces it is advisable that the area be primed first. Ultra Flexi-Prime is an ideal surface primer, as it will help to prevent water penetration, and increase bond strength.


    Ultra ProRapid RS should be added slowly to clean water (20kg White: 4.8 litres of water; 20kg Grey: 4.4 litres of water) and mixed thoroughly to give a slump free easily worked mortar. Once mixed the mortar is immediately ready for use and has a working time of approximately 20 minutes at 20°C. Mix only sufficient material to be used within the working time, do not remix or rewet.


    Apply the adhesive to a thickness of 3-6mm up to 1m2 at a time. On internal walls use a notched trowel leaving solid ribs, i.e. 3mm x 3mm at 6mm centres for mosaics, 5mm x 5mm at 10mm centres for wall tiles, and 8mm x 8mm at 16mm centres for floor tiles. On floors and external areas, use the solid bed trowel method.

    Large studded tiles should be ‘buttered’. Bed the tiles in with a slight twisting action. Leave spaces between the tiles for grouting (approximately 1-3mm for walls and 2-20mm for floors). Clean off excess adhesive from the tile face and grout lines with a damp cloth before it sets.


    Tools should be thoroughly cleaned in water to remove excess materials immediately after use.


    Leave for a minimum of 2 hours before grouting and/or walking on the tiles. This time may be extended on impervious surfaces. Instarmac’s technical team will be happy to suggest the best Ultra Grout for ultimate performance.



Packaging 20kg – triple walled paper bags.
Standard Conformity Conforms to the requirements of EN 12004 Class C2F.
Bed Thickness & Coverage 1-12mm. At 3mm bed thickness you will require 4.5kg of material per m2.
Open Time 20 minutes depending upon temperature and substrate.
Set Time 2 hours dependent upon temperature and substrate.
Storage This product must be stored in unopened bags, clear of the ground in cool dry conditions.
Shelf Life 6 months in above conditions. Please note: The use of this product after the end of the declared storage period may increase the risk of an allergic reaction. High temperatures and high humidity will lead to a reduced shelf life.
Colours Grey & White.

Please Note: All tiling should follow the correct British/European standard incorporate movement joints as specified therein.


Coronavirus Delivery Update

We are working closely with our delivery providers and can confirm all deliveries are unaffected by recent events. All orders you place on our website will continue to receive the same high standards of delivery you have come to expect from Underfloor Heating Direct.

Call us today on 0800 141 2643 to place your order.


Our delivery charges are calculated based on the weight of your entire order. Below is a table illustrating the cost for each weight bracket, please note we cap our delivery costs to a maximum of £50.

Weight From (kg) Weight To (kg) Cost
0 39.99 £10
40 59.99 £20
60 79.99 £30
80 99.99 £40
100+   £50

In addition to our standard delivery service, we can also arrange for delivery on a Saturday or before 10.30am on any working day. This level of carriage comes at an additional cost:

  • Next working day before 10.30am - Additional £5
  • Saturday - Additional £20

We can also arrange for pallet delivery on a three-day delivery, but costs vary depending on the size of the order, so please contact us for details.

Please Note: Wetroom Shower Trays will have 2 - 3 day delivery times and cannot be provisioned under our next day delivery policy.

When will I receive my order?

Orders placed before 3pm on any business day (Monday – Friday) excluding Bank Holidays should be delivered on the next business day (Excluding Saturday, unless the carriage is met) anytime up to 7.00pm.

Our standard next working day delivery does not guarantee next day delivery; however every effort is made by us and the courier to achieve this goal.

Orders taken on Friday after 3pm, Saturday or Sunday will be dispatched on Monday (excluding Bank Holidays) for delivery on Tuesday up to 7.00pm.

Orders placed on Friday before 3pm will be dispatched on Friday for delivery on Monday up to 7.00pm unless the Saturday delivery charge is met (This excludes Bank Holidays).

Please note: We rely upon the services of third party couriers and, whilst we endeavor to always deliver in a timely manner, there are unfortunately a few occasions when the couriers fail to deliver on the appointed day. This happens rarely, but because it does occur, albeit occasionally, we cannot be held responsible for the late delivery of an item, or any costs incurred by customers tradesman unable to work, please ensure you have your materials before booking in any trades.

Shipments sent outside the European Union may be subject to import duties and taxes, which may be levied once a shipment reaches your country. For details of Customs charges please consult your own Customs authorities for the latest rates.

Additional charges for customs clearance must be borne by you; unfortunately we have no control over these charges and cannot predict what they may be. We are unable to reimburse any costs incurred regardless of the circumstances.