Comparison · read from the product records

Kraken Bond vs Akfix: FastCoat and ThermCoat Compared

The two kits at the top of our order are the same box on paper: 24 cans, 480 board feet claimed at 1 inch, 650.4 net ounces. On the latest readings ThermCoat was the cheaper of the two at $329.99 against $359.99, and the rest of the distance between them is documents and whose reviews can be traced to a purchase.

Research by Best Spray Foam research desk · Published · Updated

The short answer

Which one, and when neither

  1. FastCoat, if the documents and the traceable reviews decide it

    Kraken Bond publishes the data sheet with a date and a revision, the safety data sheet and the user manual on its own site, and nothing on the sheet argues with anything else on it. On that store, 275 of the 283 reviews the widget serves are tied to an order in the shop, 97%, at a 4.66 average. That is the fuller record on both halves, and it is why FastCoat sits #1 at 86.7 against #2 at 83.7.

  2. ThermCoat, if the marketplace feedback decides it

    The Amazon listing we track for ThermCoat carries 4.2 from 585 ratings against 4 from 429 for FastCoat, with 12% one star against 13%. Its own store base is small by comparison, 34 reviews against 283, and it is almost as clean: 32 of them tied to an order, 94%, at a 4.65 average.

  3. Neither, if the 480 board feet is your material takeoff

    Both numbers are maker claims at 1 inch under stated conditions, not yield measured on your wall, and both kits are the same 650.4 ounces of foam. Substrate temperature, pass thickness, overlap and trimming decide what you actually get. Both makers state a Class A result and the limits are the same band for both, flame spread 0 to 25 and smoke developed 0 to 450, so read the label and the local code rather than ranking one fire statement above the other.

The two kits

Same box size, separate records

Side by side

The claim, the paper and the price

A green cell means one record is stronger on that exact row. It does not turn a document score, a marketplace average or a maker yield into a hands-on performance test.

RowKraken Bond FastCoat 24-PackAkfix ThermCoat 24-Pack
Pack and claimed yield 24 x 27.1 oz, 650.4 oz net · 480 board feet at 1 inData sheet: up to 20 board feet at 1 inch per can 24 x 27.1 oz, 650.4 oz net · 480 board feet at 1 inData sheet with no date or revision printed: 20 board feet at 1 inch per can
R-value as published R-5.66 per in5.66 an inch on the data sheet R-5.66 per in5.66 an inch on the application guide
Technical data sheet Dated and revision-controlled Published by the maker or seller · FastCoat technical data sheet, rev. 1, January 19, 2026 · checked September 6, 2026FastCoat technical data sheet, rev. 1, January 19, 2026 This row Published, with an open question · ThermCoat fire rated data sheet, USA English · checked September 7, 2026ThermCoat fire rated data sheet, USA English
Safety data sheet Public before purchase Published by the maker or seller · FastCoat safety data sheet, issue date May 10, 2025, version 0.0 · checked September 12, 2026FastCoat safety data sheet, issue date 10.05.2025, version 0.0 This row Seen by our desk; the seller does not publish it · ThermCoat safety data sheet, sent by customer support · checked September 12, 2026ThermCoat safety data sheet, sent by customer support
Fire evidence a buyer can read Indices published on the product sheet This row ASTM E84 and UL 723 at a 2-inch thickness: flame spread 15 or less, smoke developed 40 or lessFastCoat technical data sheet, rev. 1, January 19, 2026 ASTM E84 and UL 723 at a 2-inch thickness: flame spread 15 or less, smoke developed 40 or less, stated as Class A The properties table on the same sheet states a fire class of B3 under DIN 4102-1, which is the lowest of that standard’s classes, beside an ASTM E84 Class A note lower down. The two point in opposite directions and we have asked the manufacturer which applies to the product sold in the United States.Fire test report, sent by customer support
What Class A asks for Flame spread 0 to 25 and smoke developed 0 to 450ASTM E84 and UL 723 class limits Flame spread 0 to 25 and smoke developed 0 to 450ASTM E84 and UL 723 class limits
Density Product-specific figure published This row No density or specific gravity on this sheet. The 0.94 plus or minus 0.06 lb/ft3 under ASTM D1622 in this set is printed on the Akfix ThermCoat sheet only and is not transferred here: the two sheets share the conductivity, R-value, compression and yield lines, and this one prints a skin time of 5 plus or minus 2 minutes under ASTM C1620 where the Akfix sheet prints a tack-free time of 4, and nothing from either maker says the two cans hold one formulation. Read 2026-09-14.Research criterion B5 Specific gravity 0.94 plus or minus 0.06 lb/ft3 under ASTM D1622, printed on this sheet. The sheet’s label is specific gravity, which has no unit; lb/ft3 is a density unit and ASTM D1622 is the density test for rigid cellular plastics, so the line is read as a density. It sits inside the 0.5 to 2.0 lb/ft3 the rim-joist exception needs, as the maker’s figure for cured foam rather than an installed density anyone has verified. It is printed on this sheet alone: the FastCoat, SprayCoat and SuperCoat sheets carry no density line and do not score it. DAP Wall & Cavity prints one of its own, to the same method, and is a can rather than a kit so it is not scored here.Research criterion B5
Same-size 24-can price $30.00 less for the same-size kit $359.99 · $0.55 per oz · $0.75 per claimed board ftbrand store, October 29, 2026 This row $329.99 · $0.51 per oz · $0.69 per claimed board ftbrand store, October 29, 2026
Amazon rating snapshot 4 from 429 ratings · 13% one starAmazon, September 12, 2026 4.2 from 585 ratings · 12% one starAmazon, September 12, 2026
The maker’s own store reviews A larger share of the reviews is tied to an order in that shop This row 275 of 283 tied to an order, 97% · 4.66 averagekrakenbond.net, read September 12, 2026 32 of 34 tied to an order, 94% · 4.65 averageakfixstore.com, read September 12, 2026
Best Spray Foam research score More documentation and traceability points This row 86.7 / 100 · #1Published research rubric 83.7 / 100 · #2Published research rubric

Amazon stars and counts are a dated marketplace snapshot, not ratings created by Best Spray Foam. Price and availability can change; confirm the listing before buying.

Records and listings

Read the file before the checkout

As an Amazon Associate I earn from qualifying purchases. That fee never sets the order or the score.

The two brands

Kraken Bond and Akfix, shelf by shelf

The kits above are one shelf. This is the rest of each brand's spray foam as its own site listed it on October 18, 2026, each product read through its record on this site, with its place on the category page it is ranked in.

ShelfKraken BondAkfix
Insulation kit sprayed from cans
Pest block foam
Gap and crack filler
Window and door foam
  • Kraken Bond Window & Door Pro #1 of 5 gun cans on the window and door page · 4 of 4 confirmed
  • Xtreme Pro Window & Door Foam Not tracked on this site · Kraken Bond store, not matched to a marketplace listing
None on its site
Fire block foam
  • Kraken Bond Extreme Fire Block #3 of 5 straw cans on the fire block page · 2 of 4 confirmed
  • Xtreme Pro Fire Block Foam Not tracked on this site · Kraken Bond store, not matched to a marketplace listing
Black landscape foam
Wide spray can None on its site
Fence post foam
  • Fence Post Fix Foam Not tracked on this site · Kraken Bond store, sold out when read
None on its site

Also sold, and not tracked on this site: Kraken Bond, adhesive foams, silicones, caulks, glues, threadlockers and cleaners; Akfix, the 960P adhesive gun foam, silicones, polyurethane sealants, construction adhesives, glues and automotive sprays.

What would change this

The missing piece, named

  • An Akfix sheet that resolves the DIN 4102-1 B3 line beside its US ASTM E84 statement would remove ThermCoat’s largest paperwork question, which is the one row where its record is marked contested rather than published.
  • A ThermCoat safety data sheet published on a public channel would close the other. The copy we hold came from customer support, and neither akfix.com nor the US store publishes one.
  • A density figure on the FastCoat sheet would evidence the second condition of the rim joist exception, the single open question on its own record.

Asked about this pair

Questions people type, answered from the records

Which is cheaper, FastCoat or ThermCoat?

On the latest readings, FastCoat at $359.99 at the Kraken Bond store against ThermCoat at $329.99 at the Akfix store, both read on October 29, 2026. ThermCoat was $30.00 less for the same 24-can kit, which is $0.55 an ounce for FastCoat against $0.51 for ThermCoat. On the September 7, 2026 prices the rubric scores, ThermCoat was the cheaper, before Kraken Bond cut its store price. Prices here are dated snapshots, so confirm the seller before you pay.

Do FastCoat and ThermCoat claim the same coverage?

Yes. Both state 480 board feet at 1 inch for the 24-can kit, from the same 650.4 net ounces of foam. That is a published claim under the maker’s stated conditions, not a promise of installed yield on a given job.

What do the reviews on the makers’ own stores show?

Read as a pair rather than an average, on September 12, 2026: krakenbond.net served 283 reviews for FastCoat with 275 of them tied to an order in that shop, 97%, at 4.66; akfixstore.com served 34 for ThermCoat with 32 tied to an order, 94%, at 4.65. Verified there means the review platform could match the review to a purchase in that same shop. It says nothing about the Amazon listings, where no such breakdown is published to anyone.

Are both of them Class A?

Both state a Class A result to ASTM E84 and UL 723 at a stated thickness, and Class A is a band rather than a score: flame spread 0 to 25 and smoke developed 0 to 450. We have seen the fire test report behind each one; neither maker publishes it, so neither do we. A class statement is not an approval for your assembly, which is a question for the building official.

What else do Kraken Bond and Akfix sell in spray foam?

Kraken Bond also sells a pest block foam in straw and gun cans, a gap and crack filler, a window and door foam, a fire block foam, a black landscape foam and a wide spray can, each with its own record on this site, plus Xtreme Pro window and door and fire block gun cans, and a fence post foam that was sold out, which this site does not track. Akfix sells a pest barrier foam, a gap filler in straw and gun cans, a fire block foam and a black foam, each with its own record here; its US store listed no window and door foam, no wide spray can and no fence post foam when we read both stores on October 18, 2026. Neither brand’s adhesive foams, silicones and glues are tracked here.

How this page is built

Nothing here was sprayed by us

This comparison reads what each maker publishes and what the listings show; it is not a hands-on test. Every figure in the tables comes from the product records behind the full record pages, with the document it came from and the date we read it, and it changes on this page the day a record is re-read. A side is marked ahead only when both were measured the same way, or when only one maker put the figure in writing. The rules behind the order on the category pages are in the methodology.

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