Watco 4 Hour Epoxy Primer
Litres required: 0.00L
Based on 4.0 m² per litre- Lightwork of heavy-duty repairs
- Structural strength solutions
Watco 4 Hour Epoxy Primer prepares porous concrete floors for an epoxy coating. Its penetrating, two-part formulation reduces suction, binds friable surfaces and helps prevent air bubbles in the finish. Supplied with resin and curing agent, it allows priming and coating within the same working day.
- Fast-curing epoxy primer for internal floors.
- Virtually solvent free, high-solids formulation.
- Strengthens weak surface material before painting.
- Clear finish; may darken some substrates slightly.
Technical Data
| Pack size | 5L |
|---|---|
| Suitable substrates | Bare porous concrete, sand and cement screeds, bricks and blockwork |
| Coats | 1 |
| Minimum temperature | Air: 15°C; floor: 10°C |
| Pot life | Up to 20 minutes at 20°C |
| Concrete moisture | Below 75% RH |
Coverage
- Smooth concrete: approximately 20m² per 5L (4m²/L).
- Acid-etched concrete: approximately 15m² per 5L.
- Shot-blasted or open-textured concrete: approximately 12.5m² per 5L.
Porosity affects consumption. The calculator uses the smooth-concrete rate; allow more material for absorbent surfaces.
Directions for Use
- Remove loose material, contamination and laitance. Clean and degrease as required, rinse and let the floor dry thoroughly. Allow new concrete to dry for approximately eight weeks.
- Stir both components, combine the complete pack and mix to a uniform consistency. Immediately transfer to a tray or scuttle: mixed primer left in the tin can become dangerously hot.
- Work one coat into the surface with a medium-pile roller; use a brush at edges. Provide good ventilation.
- Overcoat when touch dry, generally after 4–8 hours, and within 48 hours. Lightly abrade if the interval is exceeded.
Limitations
For indoor, porous substrates only. Apply to a dry surface, following the technical sheet. Store at 15–25°C for at least eight hours before use and protect from frost. Unopened shelf life: 24 months. Read both safety sheets before handling.
Product FAQs
What surfaces can I prime?
Use on bare, porous concrete, sand and cement screeds, bricks and blockwork indoors. It is unsuitable for non-porous surfaces.
How much will a 5L pack cover?
Allow approximately 20m² on smooth concrete, 15m² on acid-etched concrete or 12.5m² on shot-blasted/open-textured concrete. Actual coverage depends on porosity.
When can I apply the floor coating?
The product is designed for same-day priming and coating. Follow the technical sheet: overcoat when touch dry, generally 4–8 hours, and within 48 hours. Lightly abrade if this window is exceeded.
Can I apply it to damp concrete?
Follow the technical sheet and apply to a dry surface. Concrete moisture must be below 75% RH. The primer relies on penetration into the substrate.
How long can I use the mixed primer?
Use immediately after mixing and transfer into a paint tray or scuttle. Pot life is up to 20 minutes at 20°C. Do not leave mixed material in the mixing tin, where it can heat rapidly.
What temperatures are needed?
The technical sheet specifies a minimum air temperature of 15°C and floor temperature of 10°C. Provide good ventilation.
Data Sheets
Safety Data Sheet – Curing Agent (GB)
Safety Data Sheet – Resin (GB)
We aim to deliver your products as quickly, safely and efficiently as possible. Below you'll find a full overview of our delivery process, options, pricing and terms. If you have any questions or a time-sensitive order, our team is always happy to help — just give us a call on 01902 712286.
📦 Standard Delivery
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Free delivery on all orders over £100 + VAT within UK mainland.
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For orders under £100 + VAT, a standard shipping fee will apply at checkout.
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Orders are typically delivered within 2–5 working days after receipt of cleared payment.
We use Parcelforce and FedEx as our main carriers, though this may vary based on location or size of your order.
⚠️ Important Notes on Delivery
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Orders placed after 12 midday (Monday–Friday) are usually dispatched the next working day.
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If you require urgent dispatch or Saturday delivery, please call us before placing your order.
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Do not schedule contractors or start work until goods have arrived and been checked — we cannot be held responsible for project delays due to late or damaged deliveries.
🚚 Next Day & Timed Delivery Options
We offer express shipping for orders needing a quicker turnaround:
| Service | Typical Cost* (Ex. VAT) |
|---|---|
| Next Day Delivery | £10.50 |
| Next Day AM Delivery | £15.00 |
| Specialist Items | £22–£25+ |
*Pricing depends on order contents and size. For mixed/tinted paint or specialist coatings, next-day delivery may cost more due to courier restrictions.
Please contact us if your order is time-sensitive — we’ll confirm what options are available based on your products and location.
📍 Delivery Outside UK Mainland
International Delivery
We are pleased to offer worldwide delivery on both parcel and pallet orders.
Parcel Shipments
All international parcel deliveries are handled by FedEx International. Shipping times and costs vary depending on destination, parcel size, and service availability.
Pallet Shipments (Including Dangerous Goods)
For palletised orders — including those containing dangerous goods - we work with independent specialist freight companies experienced in compliant global hazardous materials transport.
Due to the nature of these shipments, pricing and transit times are provided on a case‑by‑case basis.
Requesting an International Delivery Quote
If you would like to place an international order, simply get in touch and we will prepare a personalised shipping quote. Please provide the following details:
- Your full name
- Delivery address (including country and any required customs information)
- Details of the items you would like to order
- Quantities for each item
Once we have this information, we’ll handle the rest - from calculating the most suitable shipping method to arranging safe and compliant delivery to your destination.
🛠️ Specialist Products & Pallet Deliveries
Some coatings are made to order, particularly from premium brands like Sigma/PPG. These orders:
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May have longer lead times
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May carry a £150 + VAT delivery charge
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Could require pallet delivery — a separate charge may apply
If your order requires palletisation, we’ll contact you after checkout to confirm delivery costs. You're also welcome to contact us first for a delivery quote before placing the order.
📦 Stock & Availability
We hold a large amount of stock ready for immediate dispatch, but:
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Some products may need to be ordered in from manufacturers
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Specialist items may be tinted or made to order, causing additional lead time
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We’ll always aim to part-deliver where possible to avoid unnecessary delays
If you’re on a strict deadline, please get in touch before ordering so we can advise on delivery timeframes.
🚫 Delivery Liability
While we work hard to ensure your order arrives safely and on time, we use third-party carriers and cannot be held liable for:
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Delays in transit
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Lost shipments
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Goods damaged in delivery
If your order is damaged or delayed, please let us know as soon as possible. We are not always informed automatically by the courier, so your input is essential.
We will work with you to resolve any issues — whether that means replacing items or chasing the carrier.
Note: Address changes after dispatch may incur additional charges, so please double-check your delivery details at checkout.
🧾 Payments & Order Processing
Orders are only processed once full cleared payment has been received.
You will receive email updates at each stage of the process:
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Pending – order received
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Processing – being picked, packed or manufactured
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Dispatched – on the way with the carrier
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Back order / Part dispatched – if stock is split or delayed
Need Help?
If you're unsure about shipping costs, timelines, or need your order by a specific date, we strongly recommend giving us a quick call before placing your order:
📞 01902 712286
📧 info@andrewscoatings.co.uk
We're here to help make sure you get the right product, in the right place, at the right time.
