West System Epoxy Specs — Coverage Rates, Mix Ratios & Prices
West System epoxy products compared: published coverage rates, mix ratios, thickness caps, recoat windows and official prices — every figure cited with a Last Verified date.
Quick answer
West System sells 2 epoxy products, with published coverage figures from 291.7 to 291.7 sq ft/gal. Every figure below traces to an official West System source; anything unpublished is marked rather than estimated.
Manufacturer datasheet · 2026-11-06West System keeps the lineup focused: 2 products with clear jobs. The tables below carry every published figure with its source — run the coverage calculator for your area, then read the specs here.
West System West System 105 Resin / 205 Fast Hardener
Published coverage (status column shows published vs derived-from-official-calculator):
| Coat / basis | Thickness | Rate | Status |
|---|---|---|---|
| saturation coat (porous surfaces) | — | 291.7 sq ft/gal | derived — Group B (105-B .98 gal + 205-B .215 gal = 1.2 gal mixed) → 350–405 ft² saturation coat → 291.7–337.5 sq ft/gal computed; reinforced-coat row: 462–520 ft² → 385–433 sq ft/gal computed |
Published as a kit-coverage table, not a per-gallon chart — computed values marked derived. Thin-film marine coating class, far above the tabletop range.
Specs (official sources):
| Spec | Value |
|---|---|
| Mix ratio | 5:1 by volume — TDS weight ratio 5.19:1 (dual: pump ratio + TDS) |
| Recommended coat | 0.0625" |
| Recoat window | Wet-on-wet within open time (205 fast: ~1–2 h shop window class); cured recoat per TDS sanding guidance |
| Price | $212.55 per 1.2 gal kit ($177.13/gal) — official Price List (effective June 22, 2026): Group B 105-B $131.42 + 205-B $81.13; per-gal computed (single) |
| Typical uses | marine, boat repair, bonding, barrier coating, fiberglass reinforcing |
West System West System 105 Resin / 206 Slow Hardener
Published coverage (status column shows published vs derived-from-official-calculator):
| Coat / basis | Thickness | Rate | Status |
|---|---|---|---|
| saturation coat (porous surfaces) | — | 291.7 sq ft/gal | derived — official table lists 205-B or 206-B on the same coverage rows: Group B 1.2 gal mixed → 350–405 ft² → computed 291.7–337.5 sq ft/gal |
Same official table as the 205 system — per-gallon values computed, marked derived.
Specs (official sources):
| Spec | Value |
|---|---|
| Mix ratio | 5:1 by volume — TDS weight ratio 5.36:1 (dual); same Coating Quantity table as 205 |
| Recommended coat | 0.0625" |
| Recoat window | Wet-on-wet within open time (206 slow: extended working time / higher shop temperatures) |
| Price | $205.8 per 1.2 gal kit ($171.5/gal) — official Price List components summed ($131.42 + $74.38), computed — combination price not printed directly (single) |
| Typical uses | marine, bonding, barrier coating, extended working time, not intended for clear coating |
Sources & verification
Captured 2026-11-06. WAF-protected pages were read from official archived snapshots or the brands' own Shopify/Zendesk endpoints — every quote still traces to an official West System channel, with the access route noted where relevant. Full per-verbatim collection records live in this site's data file.
- https://www.westsystem.com/products/105-system/
- https://www.westsystem.com/products/205-fast-hardener/
- https://www.westsystem.com/products/206-slow-hardener/
Use the numbers
- Coverage calculator — pick the West System product, enter your area, get gallons with this rate.
- Cost calculator — the same job priced against every other brand.
- Mix ratio calculator — exact Part A/B splits at 5:1.
How to read these tables
Three habits make spec sheets comparable instead of confusing. First, read the coverage rows before the price rows: a cheaper per-gallon price on a product that covers less ground can be the more expensive pour, and the calculator above is the honest tiebreaker. Second, treat the thickness caps as hard limits, not suggestions — a coating product pushed into casting depth fails from the inside out, by heat, hours after the pour looked fine. Third, check the recoat window against your actual schedule: a 3-hour window means the second coat goes on the same afternoon or not at all without sanding, and a day-long deep-pour window means a weekend, not an evening. Every value above keeps its source and verification mark so those trade-offs can be argued with data — and where a row reads "(to be verified)", it means the brand does not publish the figure, not that we skipped it.
FAQ
What coverage does West System publish?
The published figures are in the tables below with their sources — use them for West System products before the theoretical baseline. The [coverage calculator](/epoxy-coverage-calculator) switches rates automatically when you pick a West System product.
Where do these West System specifications come from?
Every figure is captured from West System's own published material — official product pages, TDS documents and help-center articles — with the source link shown under each table and a Last Verified date (2026-11-06). Where the same figure appears on two official pages it is marked dual-verified.
Is West System the best epoxy for my project?
Size the project first — area and thickness through the [coverage calculator](/epoxy-coverage-calculator) — then compare candidates on the specs that matter for your job: max coat thickness for builds, recoat window for schedules, and the price per gallon from the [cost calculator](/epoxy-cost-calculator). "Best" without a project is marketing.
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