Best Spray Foam Value

On the figures the sellers publish, the single-can kits are, at $0.62 to $0.81 a claimed board foot against $1.33 to $2.04 for the closed-cell canister kits. That is the opposite of what the category usually says, and it comes with a large caveat: the can kits' denominator is a number no maker measures or defines, while two of the four canister makers print that theirs is a laboratory figure. Cheaper per claimed unit is not the same as cheaper per delivered unit.

Because they are different purchases. Most kits sell a foam-only pack for people who already own a gun and a kit pack that adds the gun, a cleaner and sometimes gloves and glasses. Comparing a bundle price against a foam-only price makes the bundle look expensive and tells you nothing. The table below says which one each figure is.

Usually, and the exceptions are worth knowing. 24 listing rows in this snapshot carry a price we will not publish. 3 of them are the wrong half of a pair where a larger pack of the same can costs the same as a smaller one or less, which is a marketplace artefact rather than a deal. Which half is wrong is decided by the rest of that product's prices, so a single can listed at a 12-pack's price is withheld and the 12-pack is not. The other 21 were read while the listing had a different pack selected, which is our own collection error rather than the seller's: one 12 oz can was carrying the price of a 48-pack. All of them are withheld from every figure on this site, because a twelve-pack priced like one can would win every comparison here.

No, and the site does not order anything by price alone. Price per ounce compares what you are sold, not what it does. A gap filler and a wide-spray can both hold twelve ounces and are not alternatives; a fire block can and a black landscape can are the same base foam with different claims and different evidence. Use price to break a tie between products that already pass the same category test.