Comparison · read from the product records

Great Stuff vs Great Stuff PRO: Straw Can or Gun Can

Same brand, two different purchases. The straw can is a one-job can that hardens once you open it. The PRO can threads onto a gun you buy separately and stays usable on it for 30 days. DuPont states 1 in for the straw can and up to 3 in for the PRO with its gun.

Research by Best Spray Foam research desk · Published and updated

The short answer

Which one, and when neither

  1. The straw can, for one job this weekend

    Nothing else to buy, cans of 12 or 20 oz, tack-free in 5 to 15 min at 70 F, and DuPont is the seller of record on the listing we link. What you accept is the 1 in gap limit and a can you finish or waste, because the straw is taped to it and the foam sets in the tube.

  2. The PRO can, once the job is more than a can or two

    Up to 3 in with the PRO dispensing gun, reusable for 30 days while it stays on the gun, tack-free in 3 to 10 min, in cans of 24 or 30 oz. Two things before you order. A gun is a separate purchase, and on Amazon this can reaches you through M&P Export Management Corporation rather than DuPont, in listings whose titles do not state the pack count, so the same title can be one can at one price and a case at another.

  3. Neither, for a window frame, and read the orange can twice

    A frame wants a low-expansion foam made for frames, which is a different can from either of these. And the PRO can is orange because DuPont calls it fireblock formulated: the page names ASTM E84, a modified ASTM E814 and UL 1715 without printing a single index value or report number, so it is a fire claim you cannot look up. The fire block page reads that claim against the rest of the category.

The two cans

What each maker publishes, and where

Side by side

Row by row, from the records

Every cell is read from the product record at build time, with the document it came from. A row marks one side only when both were measured the same way, or when only one maker put the figure in writing; everything else is printed without a mark.

RowGreat Stuff Gaps & CracksGreat Stuff PRO Gaps & Cracks
Data sheet No technical data sheet for this canPublished instead: safety data sheet, product page No technical data sheet for this canPublished instead: safety data sheet, product page
Gap size Up to 1 in Up to 3 in with the PRO dispensing gun
Yield Not published Not published
Cured foam Not published Not published
Working temperature and cure Interior and exterior, paint or cover outdoors; product temperature 60 to 90 FTack-free in 5 to 15 min at 70 F and 50 percent RH for a 1 in bead; trimmable in one hour Tack-free in 3 to 10 min; trimmable in one hour
Fire wording "UL classified" with no category and no file number, which is the same gap we flag on other brands Three test methods named, ASTM E84, ASTM E814 modified and UL 1715; no index values or report numbers on the page"UL classified" with no category and no file number, which is the same gap we flag on other brands
Seller on Amazon Sold by DuPont, the brand buyer. Sold by M&P Export Management Corporation, a reseller that lists Great Stuff, Enerfoam and DAP products. The brand itself is not the seller of record.
Amazon ratingA count of buyers who rated the listing, not a measure of the foam. 4.5 from 1,922 ratingsOn the listing we link, read October 29, 2026 4.5 from 528 ratingsOn the listing we link, read October 29, 2026
Open questions on the record The 20 oz can (item 157911) is not described on the brand site; its gap limit is assumed to match the 12 oz can and has not been confirmed. The 30 oz can sold on Amazon does not appear on the brand page, which lists 24 oz only.For fire block use the buyer needs the tested configuration and the index values. DuPont names the methods only; the complete version of such a claim, with file numbers, exists in the trade (Loctite publishes one for its Pro Gaps & Cracks Foam), so this is a publishing choice rather than a limit of the category.
Price per ounceNot comparable: one is a straw can and the other a gun can, so the prices are for different purchases and one of them needs a gun. $53.99 for 12 x 12 oz, $0.37 an ounceAmazon, October 29, 2026 $2410.49 for 192 x 24 oz, $0.52 an ounceAmazon, October 29, 2026
Evidence checks More of the four checks confirmed This one 2 of 4 checks confirmed#9 on the gap filler page, straw cans 1 of 4 checks confirmed#5 on the gap filler page, gun cans

Great Stuff Gaps & Cracks

  • 12 x 12 oz: $53.99
  • 1 x 20 oz: $16.99

Great Stuff PRO Gaps & Cracks

  • 12 x 24 oz: $157.95
  • pallet, 16 cases of 24 oz: $2410.49
  • 24 oz, pack count not in the title: $157.95
  • 12 x 30 oz: $194.29
  • 30 oz, pack count not in the title: $194.28
  • complete kit, 24 oz can with gun, cleaner and gloves with gun and cleaner: $79.29
  • 24 oz kit, pack count not in the title with gun and cleaner: $199.00

Where to look

The listings and the records

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

Great Stuff Gaps & Cracks

See it on Amazon Full record

Great Stuff PRO Gaps & Cracks

See it on Amazon Walmart Full record

What would change this

The missing piece, named

  • A dated data sheet from DuPont for either can, with a yield and the conditions behind the gap limit, would lift both above the web-page evidence they stand on today.
  • Index values and a report number behind the PRO can’s fireblock wording would turn a named test into a checkable result.

Asked about this pair

Questions people type, answered from the records

What is the difference between Great Stuff and Great Stuff PRO?

The dispenser and the limits that come with it. The consumer can has a straw taped to it, comes in 12 and 20 oz, and DuPont states a gap limit of 1 in. The PRO can threads onto a PRO dispensing gun, comes in 24 and 30 oz, is stated for gaps up to 3 in with that gun, and stays usable for 30 days while it is left on the gun. The PRO can is also orange and described as fireblock formulated, which the consumer can is not.

Do I need a gun for Great Stuff PRO?

Yes. The PRO can has a threaded valve and no straw, so it needs a foam gun, which is a separate purchase. That is the part to weigh before switching: a gun pays for itself over several cans because you can meter the bead and leave the can attached for 30 days, and it is dead money if the job is one can.

Is Great Stuff PRO Gaps & Cracks a fire block foam?

DuPont describes it as fireblock formulated and orange for inspection, and names three test methods on the product page: ASTM E84, a modified ASTM E814 and UL 1715. It publishes no index values and no file or report number for any of them, so there is nothing a code official can look up. If the opening is a fireblocking location, our fire block page shows which cans in our set carry a fireblocking evaluation with a report number.

Which is cheaper per ounce?

Read the pack, not the label. On the September 7, 2026 snapshot the cheapest ounce we hold for the consumer can is $0.37, from a case of 12 cans of 12 oz at $53.27, and for the PRO can $0.52, from a pallet of 192 cans of 24 oz at $2,410.49. A single PRO can with a gun and cleaner was $79.29 on the same day, and a gun on its own is a separate purchase we price on the guns and cleaners page, which is the real cost of switching.

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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