How much area does a Group A pack of WEST SYSTEM epoxy cover?

105-A Resin with 205-A or 206-A Hardener makes 1.15 L (1.30 kg) of mixed epoxy, covering 8.5–10 m² as a saturation coat on a porous surface or 11–12.5 m² as buildup coats on a non-porous surface. With 207-A or 209-A Hardener the same resin makes 1.26 L (1.41 kg) and covers 9–10 m² and 11–13 m² respectively.

Which hardener should I use for a clear epoxy coating?

Use 207 Special Clear Hardener with 105 Epoxy Resin, and warm both parts to about 27 °C (80 °F) before dispensing to reduce viscosity.

WEST SYSTEM^® | Epoxy Basics | Guide 04

Coating Quantity

Work out how much WEST SYSTEM epoxy a job needs before you open a pack: allow 8.2 m² per kilogram of mixed epoxy for a sealer coat, and 3.7 kg per square metre for a 3.2 mm flow coat.

The quantity table below pairs each 105 Epoxy Resin^® pack size with its matching hardener, gives the mixed volume and mass, and states the area that mix will cover as a saturation coat on a porous surface and as buildup coats on a non-porous one. ATL Composites manufactures and distributes WEST SYSTEM in Australia, so the pack sizes quoted here are the ones you will be buying.

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8.2 m²/kgSealer coat coverage, mixed epoxy (40 ft²/lb)
3.7 kg/m²Flow coat over a sealed surface (0.75 lb/ft²)
3.2 mmTypical flow coat thickness (1/8 in)

Coverage figures from WEST SYSTEM instructional material. Confirm quantities against the current technical data sheet and your own test area.

Key points

Sealer coat: allow 8.2 m² per kilogram of mixed epoxy (40 ft² per pound).
Flow coat: a 3.2 mm (1/8 in) flow coat over a sealed surface takes about 3.7 kg per square metre (0.75 lb per ft²).
Porous surfaces drink more. The same mix covers a smaller area as a saturation coat on timber or core than it does as a buildup coat on a non-porous surface.
Clear finishes: use 207 Special Clear Hardener^® with 105 Resin.
Large batches cure faster. A big mixed mass has a short pot life and can exotherm — use a slower hardener and decant into a wide container.

Clear finishes and mixing by volume

Method notes

Best clear finish

For the best clear finish applications, use 207 Special Clear Hardener^® with 105 Epoxy Resin^®.

If the Mini Pumps pump too slowly

If Mini Pumps pump too slowly for the quantity you are mixing, you can mix the epoxy by volume instead. Refer to the hardener label for the correct volume mix ratio.

When working with a large quantity of mixed epoxy, keep the shorter pot life and the risk of exotherm in mind. Use a slower hardener, preferably 207 Special Clear Hardener.

Coverage figures from Table Top Applications by J.R. Watson, Epoxyworks #22.

Questions we get asked about coating quantity

4 questions

How much epoxy do I need per square metre?

For a sealer coat, allow 8.2 m² of coverage per kilogram of mixed epoxy. For a flow coat about 3.2 mm (1/8 in) thick over a sealed surface, allow 3.7 kg of mixed epoxy per square metre.

Which hardener should I use for a clear coating?

207 Special Clear Hardener^® with 105 Epoxy Resin^®.

Can I mix WEST SYSTEM epoxy by volume instead of using pumps?

Yes. Refer to the hardener label for the correct volume mix ratio. With large mixed quantities remember that pot life shortens and a contained mass can exotherm, so choose a slower hardener — preferably 207 Special Clear Hardener — and decant into a container with more surface area.

WEST SYSTEM products for this job

Supplied by ATL Composites

Resin & hardeners

WEST SYSTEM^® 105 System

105 Epoxy Resin with 205 Fast, 206 Slow, 207 Special Clear and 209 Extra Slow Hardeners, in A, B and C pack sizes.
Dispensing

WEST SYSTEM^® 300 Mini Pumps

301 and 303 Mini Pumps, calibrated to deliver the correct working ratio of resin to hardener.

Browse the full WEST SYSTEM range supplied by ATL Composites.

View the WEST SYSTEM range

Guide only. Adapted from WEST SYSTEM instructional material (original guide). Read the product label and the current technical and safety data sheets before use.

WEST SYSTEM Epoxy Basics

Guide 04 of 11

Not sure how much to order?

Contact ATL Composites for product-selection support on +61 7 5563 1222 or [email protected].

Find a reseller +61 7 5563 1222

WEST SYSTEM^®, 105 Epoxy Resin^®, 205 Fast Hardener^®, 206 Slow Hardener^®, 207 Special Clear Hardener^® and 209 Extra Slow Hardener^® are registered trademarks of Gougeon Brothers, Inc., USA. Manufactured and distributed in Australia by ATL Composites Pty Ltd. Diagrams and instructions courtesy of WEST SYSTEM.