Is DAP Wall & Cavity Spray Foam worth it?

It is a reasonable pick for small interior fire-rated sealing jobs where a full kit is overkill. For big cavities, a larger two-component kit costs less per board foot.

Yes, but only with a high-quality acrylic-latex water-based paint. It is not permanently flexible, so use a flexible sealant on joints that move.

How long until it cures?

It is tack-free in 7 to 12 minutes and dry to touch in about 12 minutes. Full cure takes 24 hours.

Indoors, on wood, drywall, masonry and most metals, at temperatures from 40F to 120F. It is not for exterior use.

How much does one can cover?

A 20 oz can covers small gaps and penetrations, not whole wall cavities. Buy several cans or a kit for larger areas.

Only one store listed it new at $28.98 on eBay as of November 4, 2026, so there is little price competition to wait for.

Where is the DAP Wall & Cavity Spray Foam cheapest?

At eBay, for $28.98, as of our latest check.

What do buyers say about the DAP Wall & Cavity Spray Foam?

Rated 3 out of 5 from 121 ratings.

Where can I buy the DAP Wall & Cavity Spray Foam?

12 stores we checked sell it, including eBay, Carr Hardware, DK Hardware, Do it Best, Family Hardware.

DAP Wall & Cavity Spray Foam

3

Best price now

$28.98at eBayObserved at 3:04 PM

Prices are checked against each store and labelled with when.

Visit eBay

DAP Wall & Cavity Spray Foam

3

Best price now

$28.98at eBayObserved at 3:04 PM

Prices are checked against each store and labelled with when.

Visit eBay

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Our take on the DAP Wall & Cavity Spray Foam

DAP Wall & Cavity Spray Foam is a 20 oz polyurethane foam can for sealing gaps inside walls and cavities. It is Class A fire rated, has high closed-cell content, and uses a Widespray applicator for wider coverage. Dry to touch in about 12 minutes and fully cured in 24 hours. The best new price is $28.98 at eBay as of November 4, 2026, and only one store lists it new.

Best forSealing gaps around pipes and wiring in wall cavitiesInterior air-sealing and draft blockingFire-rated interior penetrations in wood, drywall and masonrySmall insulation jobs where a can beats a kit

Pros

Class A fire rating suits code-sensitive interior work
High closed-cell content gives good insulating value per inch
Widespray applicator covers gaps faster than a straw nozzle
Bonds to wood, drywall, masonry and most metals
Tack-free in 7 to 12 minutes, so trimming is quick

Cons

Not permanently flexible, so it can crack where joints move
Paintable only with high-quality acrylic-latex paint
Interior use only
One 20 oz can goes a short way on larger cavities
Shelf life is 12 months, so leftover cans go bad

DAP Wall & Cavity Spray Foam prices at every store

eBayNew
In stockSold by findtape
$28.98Observed at 3:04 PM
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Also available at

Carr HardwareCheck price at Carr Hardware
DK HardwareCheck price at DK Hardware
Do it BestCheck price at Do it Best
Family HardwareCheck price at Family Hardware
FindTape.comCheck price at FindTape.com
Fleet FarmCheck price at Fleet Farm
Hellers HardwareCheck price at Hellers Hardware
Herald Office SupplyCheck price at Herald Office Supply
MenardsCheck price at Menards
S.W. CollinsCheck price at S.W. Collins
True ValueCheck price at True Value

DAP Wall & Cavity Spray Foam price history

Lowest price we've seen: $16.77 on Nov 4 at FindTape.com. Tracked across 13 stores since Nov 4.

What reviewers say

Ratings average 3 out of 5 from 121 ratings, which points to a mixed reception. Owners tend to like the fire rating and fast set but report uneven cans and messy application.

Pros

Sets quickly and trims cleanly
Good adhesion on common building materials
Fire rating is a plus for interior sealing

Cons

Cans that spray poorly or sputter
Expansion is hard to control around openings
Value for the amount of foam delivered

Specifications

Form: Foam
Product Type: Foam Sealant, Spray Foam Insulation
Chemical Basis: Polyurethane
Formula: Class A fire rated
Material: Foam
Resistance: Class A fire rated
Cure Time: 24 hours
Temperature Resistance: High Heat Resistant
Service Life: 12 months (shelf life)
Adhesion: Bonds to most common building materials
Flexibility: Permanently Flexible: No
Paintability: No
Application Location: Interior
Application Substrate: Wood, Drywall, Masonry, Metals
Application Method: Widespray Applicator
Application Temperature Range: 40F - 120F
Container Volume: 20 oz
Container Type: Can
Container Size: 20 Oz
Weight: 20 oz
Finish: Paintable (with high quality acrylic-latex (water-based) paints)
Set Time: 12 min (dry to touch)
Tack Free Time: 7 to 12 minutes

Questions and answers

Is DAP Wall & Cavity Spray Foam worth it?: It is a reasonable pick for small interior fire-rated sealing jobs where a full kit is overkill. For big cavities, a larger two-component kit costs less per board foot.
Can I paint over it?: Yes, but only with a high-quality acrylic-latex water-based paint. It is not permanently flexible, so use a flexible sealant on joints that move.
How long until it cures?: It is tack-free in 7 to 12 minutes and dry to touch in about 12 minutes. Full cure takes 24 hours.
Where can I use it?: Indoors, on wood, drywall, masonry and most metals, at temperatures from 40F to 120F. It is not for exterior use.
How much does one can cover?: A 20 oz can covers small gaps and penetrations, not whole wall cavities. Buy several cans or a kit for larger areas.
When is it cheapest?: Only one store listed it new at $28.98 on eBay as of November 4, 2026, so there is little price competition to wait for.
Where is the DAP Wall & Cavity Spray Foam cheapest?: At eBay, for $28.98, as of our latest check.
What do buyers say about the DAP Wall & Cavity Spray Foam?: Rated 3 out of 5 from 121 ratings.
Where can I buy the DAP Wall & Cavity Spray Foam?: 12 stores we checked sell it, including eBay, Carr Hardware, DK Hardware, Do it Best, Family Hardware.

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