F Ball - Stopgap 400 Repair (5kg) Rapid Repair Compound for Floors

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In stock
  • 2 items +    £14.00
  • 5 items +    £13.57
  • Available for Next Day Delivery
  • FREE Delivery when you spend over £125

F Ball - Stopgap 400 Repair (5kg) Rapid Repair Compound for Floors

STOPGAP 400 is a fast setting, rapid drying compound for repairing internal floors prior to the application of STOPGAP smoothing underlayments in light to heavy duty applications. It is also suitable for use on stairs, steps and general repairs to cracks and holes. 

STOPGAP 400 is dimensionally stable and is supplied as a pre-blended dry powder designed for applications between 2-50mm. It is protein-free which allows it to be used in biologically sensitive areas. 

STOPGAP 400 is suitable for use over a wide range of subfloor types including sand/cement screed, concrete, sound asphalt, granolithic, terrazzo, epoxy and polyurethane resins, ceramic and quarry tiles and STOPGAP waterproof surface membranes.

Technical Information:

  • Appearance: 5kg fully recyclable eco pouch
  • Working Time @ 20°C: 15-20 minutes
  • Walk on hardness time @ 20°C: 20-30 minutes
  • Consumption per mm thickness: 1.63 kg / m2
  • Application thickness: from 2 - 50mm
  • Available in: 5kg and 10kg  capacity



Standard Mix - A 5kg unit of STOPGAP 400 mixed with 1.15 litres of clean water will cover approximately 1m2 at a thickness of 3mm. 

1 litre of mortar will cover approximately 1m2 per mm in thickness. 

Filled Mix5kg of STOPGAP 400 powder mixed with an equal volume of STOPGAP GRADED AGGREGATE, mixed with 1 litre of water will cover approximately 0.5m2 at a thickness of 10mm.


For best results over a large area, a minimum thickness of 2 – 3mm should be maintained. Trowel the mix onto the subfloor and spread to the required thickness with a steel trowel. For increased economy, with applications of more than 6mm, the filled mix can be used. If a smooth finish is required, the filled mix can be applied below the required level and allowed to set, and then smoothed with a layer of unfilled mortar or a STOPGAP floor smoothing underlayment. If required the finish of the mortar can be improved by the use of a wet smoothing trowel before the mortar has fully set, typically 15 to 20 minutes at 20ºC. This product is not recommended for external use

For any areas under question please consult the F Ball Technical team.


The initial set time of the repair compound is approximately 15 to 25 minutes and should be sufficiently hard to walk on in about 30 minutes under good conditions. Low temperatures will extend this time.


STOPGAP 400 is suitable for fast track applications. Floorcoverings can be applied after 1½ hours at 20°C @ 2mm.


Suitable steel smoothing trowel, spiked roller, mixing bucket, electric drill and power whisk. Wash tools with water immediately after use.


This product must be stored under cover, in unopened pouches clear of the ground in cool dry conditions, protected from frost and excessive draught.

Shelf Life:

12 months in unopened pouches and stored under good conditions.

Delivery Information

We aim to dispatch all orders within 2 working day of receipt. Occasionally public holidays, weekends, weather events, or extremely busy periods may result in extended delivery times. In these circumstances, we will endeavour to communicate with you about the delay and resolve and resulting issues.

Please note that we do not make delivery date promises, however:

- Orders placed before 1pm on a weekday will be processed the same day.

- Orders placed after 1pm on a weekday will be processed the following morning. 

- Orders placed after 1pm on Thursday will be processed and dispatched the following day and out for delivery the following Monday (if Next Day Delivery is selected).

- Orders placed after 1pm on Fridays will be processed and dispatched on the following Monday.

For more information about our Shipping & Delivery services click HERE


UK Mainland Delivery Options:


Free Delivery: Applicable for orders of £125 excl. VAT and above
(Monday – Friday, excluding public holidays)


Collect From Store: 41 Markfield Road, London N15 4QA
(Monday – Friday, 9am–5pm excluding public holidays)


Standard Delivery: 3-5 Working Days
(Monday – Friday, excluding public holidays)


Express Delivery: Next Working Day
(Monday – Friday, excluding public holidays)

Out Of Zone Delivery Surcharges:

Isle of Wight

£12.50 per item (3-5 Working Days)

Isles of Scilly

£12.50 per item (3-5 Working Days)

Northern Ireland

£25.00 per item (3-5 Working Days)

Western Isles

£25.00 per item (3-5 Working Days)

Shetland Isles

£30.00 per item (3-5 Working Days)


£30.00 per item (3-5 Working Days)

Isle Of Man

£30.00 per item (3-5 Working Days)

Channel Islands

£30.00 per item

Republic of Ireland

Not Available


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