Sigma tin image with colour wheel on a white background

SigmaDur 550

Regular price
Unit Price:

£176.28 (inc. VAT)
£146.90 (ex. VAT)

/
Size
  • Can’t see your colour? Contact us — we can probably mix it

PPG SigmaDur 550 – High-Performance Polyurethane Finish for Extreme Weathering

PPG SigmaDur 550 is a two-component, aliphatic acrylic polyurethane finish engineered for outstanding durability and long-term colour retention in harsh atmospheric environments. Curing at temperatures down to -5°C (23°F) and fully resilient to UV exposure, it offers a non-yellowing, non-chalking finish ideal for demanding architectural, industrial and marine structures.

With availability in thousands of colour options including RAL, BS and NCS systems, SigmaDur 550 provides exceptional design flexibility. It can also be recoated an unlimited number of times, even after extended weather exposure, making it ideal for long lifecycle maintenance programs.

Trusted globally, SigmaDur 550 is notably used on the exterior of the Padma Multipurpose Bridge in Bangladesh, showcasing its proven performance in extreme climates.

Key Features:

  • Two-component aliphatic polyurethane finish

  • Available in RAL, BS, NCS & custom colours

  • Excellent colour and gloss retention

  • Non-yellowing, non-chalking finish

  • Cures in low temperatures down to -5°C (23°F)

  • Resistant to splash of mineral & vegetable oils, paraffins & mild chemicals

  • Unlimited recoatability, even after long atmospheric exposure

  • Smooth application properties by spray or roller

  • Designed for high-performance architectural, industrial & marine use

Surface Preparation

Substrate conditions
• Previous coat (epoxy or polyurethane) must be dry and free from any contamination
• Previous coat: surface should be sufficiently roughened if necessary
Substrate temperature and application conditions
• Substrate temperature during application at -5°C (23°F) is acceptable; provided the substrate is free from ice and dry
• Substrate temperature during application and curing should be at least 3°C (37°F) above dew point
• Relative humidity during application and curing should not exceed 85%
• Should condensation on the surface occur during, or soon after application, this could result in colour and gloss change

Technical Data

Pot life
5 hours at 20°C (68°F)
Note:
- See ADDITIONAL DATA – Pot life

Spreading rate and film thickness
DFT Theoretical spreading rate
50 µm (2.0 mils) 11.0 m²/l (441 ft²/US gal)
60 µm (2.4 mils) 9.2 m²/l (368 ft²/US gal)
75 µm (3.0 mils) 7.3 m²/l (294 ft²/US gal)

Directions for Use

Mixing ratio by volume: base to hardener 88:12 (7.33:1)
• The temperature of the mixed base and hardener should be above 10°C (50°F), otherwise extra thinner may be
required to obtain application viscosity
• Thinner should be added after mixing the components
• Adding too much thinner results in reduced sag resistance

Air spray
Recommended thinner
THINNER 21-06
Volume of thinner
3 - 5%, 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
3 - 5%, 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

SigmaDur 550 TDS

SigmaDur 550 Base MSDS

SigmaDur 550 Hardener MSDS

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

  • Free delivery on all orders over £100 + VAT within UK mainland.

  • For orders under £100 + VAT, a standard shipping fee will apply at checkout.

  • 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

  • Orders placed after 12 midday (Monday–Friday) are usually dispatched the next working day.

  • If you require urgent dispatch or Saturday delivery, please call us before placing your order.

  • 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:

  • Northern Ireland

  • Isle of Man

  • Channel Islands

  • Republic of Ireland

  • 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:

  • May have longer lead times

  • May carry a £150 + VAT delivery charge

  • 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:

  • Some products may need to be ordered in from manufacturers

  • Specialist items may be tinted or made to order, causing additional lead time

  • 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:

  • Delays in transit

  • Lost shipments

  • 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:

  • Pending – order received

  • Processing – being picked, packed or manufactured

  • Dispatched – on the way with the carrier

  • 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.

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Testimonials

★★★★★

I stumbled across Andrews Coating Services as i was moaning about having spent laids on Everest (waste of a LOT of money) Concrete driveway paint and sealant only for petals to stick to it in rain, fade really badly, and peal away after 18 mths.
I spoke to Matt initially and explained my predicament and what i wanted to achieve with the paint and its application, his knowledge is second to none and having qualified my needs unlike the generic paint suppliers his can do attitude and understanding and quick turnaround made me visit him and place orders, the fact that you can choose pit of 70k+ colours is great but the fact that they just don't do domestic paints they also do specilaist paints such as hygienic wipe down and commercial and a vast array of other types too...

Paul Saib
Walsall, UK
★★★★★

I can't fault the service and courtesy of this firm. The order was delivered as promised, and when a slight issue arose, it was corrected without question and quickly. I would use this firm repeatedly, and it is refreshing to find such good service nowadays. Also, they stocked the specialist products I wanted, when many were unable to supply. I am a customer for life.

Michael Walsh
★★★★★

On behalf of the team at FlowCopter Ltd. I'd like to thank You for Your services, ease of contact, the technical know-how and very competitive prices. On top of all that, order processing and delivery time was beyond any expectations ! TOP notch company. Highly Recommended.

Marek Szupryczynski
LOANHEAD, UK
★★★★★

Excellent service from this company again. Enquiries are dealt with quickly and politely and order arrived well within estimated time with full tracking information provided. This is my second order and wouldn't hesitate to deal with them again.

Kelvin Appleby
DURHAM, UK
★★★★★

First class service. Thanks to the knowledge and experience of Andrews Coatings Ltd we now have solved a challenging problem through the use of an easily applied peelable coating. 👍👍👍

Graham Williams
★★★★★

I've used Andrews Coatings quite a few times over the last few months and their service has always been first class.
This is especially true when a manufacturer discontinued a paint - The customer service department went out of their way to obtain any available materials to allow me to complete my project. I can't recommend highly enough!

Daniel Pointon
LEICESTERSHIRE

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