SigmaDur 550 H
£230.22 (inc. VAT)
£191.85 (ex. VAT)
- Can’t see your colour? Contact us — we can probably mix it
PPG SigmaDur 550 H – High-Build Polyurethane Finish (Formerly Sigmadur 568)
PPG SigmaDur 550 H is a two-component, high-solids, high-build aliphatic acrylic polyurethane finish designed for long-term resistance in demanding atmospheric environments. Offering excellent colour and gloss retention, this coating provides a tough, durable finish resistant to splash exposure from mineral and vegetable oils, paraffins, aliphatic hydrocarbons, and mild chemicals.
Formulated for high-build applications up to 150 μm (6.0 mils) in a single coat, SigmaDur 550 H can be applied direct-to-metal, reducing system complexity and application time. It cures at temperatures down to –5°C (23°F) and can be recoated even after prolonged exposure, making it suitable for both new projects and long-term maintenance cycles.
Available in thousands of colours, including RAL, BS, and NCS, this finish can be applied via airless spray, brush or roller, offering excellent application flexibility. Drying and curing times can be significantly accelerated when used with PPG 866M Accelerator.
Key Features:
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Two-component, high-solids, high-build aliphatic polyurethane finish
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Available in thousands of colours (RAL, BS, NCS)
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Excellent UV durability with long-term colour & gloss retention
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High-build application up to 150 μm in one coat
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Can be applied direct-to-metal
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Cures down to –5°C (23°F)
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Resistant to splash of oils, paraffins & mild chemicals
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Recoatable after long atmospheric exposure
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Faster cure available using PPG 866M Accelerator
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Suitable for airless spray, brush or roller application
Surface Preparation
Substrate conditions
• Steel; blast cleaned to ISO-Sa2½, blasting profile 40 – 70 µm (1.6 – 2.8 mils) or power tool cleaned to ISO-St3
• Compatible previous coat must be dry and free from any contamination
Substrate temperature and application conditions
• Substrate temperature during application and curing should be at least 3°C (5°F) above dew point
• Substrate temperature during application and curing down to -5°C (23°F) is acceptable; provided the substrate is
free from ice and dry
• Relative humidity during application and curing should not exceed 85%
• Premature exposure to early condensation and rain may cause color and gloss change
Technical Data
Spreading rate and film thickness
DFT Theoretical spreading rate
50 µm (2.0 mils) 14.0 m²/l (561 ft²/US gal)
75 µm (3.0 mils) 9.3 m²/l (374 ft²/US gal)
100 µm (4.0 mils) 7.0 m²/l (281 ft²/US gal)
150 µm (6.0 mils) 4.7 m²/l (187 ft²/US gal)
Directions for Use
Mixing ratio by volume: base to hardener 6.69:1
• Do not thin more than is required by appropriate application property
• Adding too much thinner results in reduced sag resistance
• Thinner should be added after mixing the components
Air spray
Recommended thinner
THINNER 21-06
Volume of thinner
10 - 15%, depending on required thickness and application conditions
Nozzle orifice
1.0 - 1.5 mm (approx. 0.040 - 0.060 in)
Nozzle pressure
0.3 - 0.4 MPa (approx. 3 - 4 bar; 44 - 58 p.s.i.)
Airless spray
Recommended thinner
THINNER 21-06
Volume of thinner
0 - 10%, depending on required thickness and application conditions
Nozzle orifice
Approx. 0.43 – 0.48 mm (0.017 – 0.019 in)
Nozzle pressure
20.0 MPa (approx. 200 bar; 2901 p.s.i.)
Brush/roller
Recommended thinner
THINNER 21-06
Volume of thinner
0 - 5%
Cleaning solvent
• THINNER 90-53
Data Sheets
Delivery Information
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
For locations such as:
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Northern Ireland
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Isle of Man
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Channel Islands
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Republic of Ireland
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Scottish Highlands or Islands
Additional courier surcharges may apply. These are not always visible at checkout, so we may contact you after your order is placed to confirm the final shipping charge.
🛠️ 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.
