Flex Shot Rubber Sealant: Where to Buy, Colors, and Cure Time
Flex Shot is a thick rubber adhesive sealant caulk sold in an 8 oz can with a push nozzle, so it lays a bead without a caulking gun. It’s pitched to fill huge cracks and holes around tubs, sinks, doors, and RV joints, then cures into a stretchy rubber seal that won’t shrink or crack. It comes in White, Clear, Almond, and Black, and the color you need decides which store is worth the trip.
It belongs to the Flex Seal family of products and rose to fame through Phil Swift, one of the loudest infomercial pitchmen behind as-seen-on-TV products. Fans of the infomercial format will file his screen-door-on-a-submarine line with other iconic infomercial catchphrases.
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Bead, Hybrid Caulk, Spray, or Silicone: Which Fits the Repair?
Choose by the shape of the damage: a joint wants a bead, a broad leaky surface wants a coating. The maker calls this can a silicone-based rubber sealant and its sibling Flex Caulk a hybrid polymer caulk, and that chemistry is the main reason to pick one over the other.
| Product | Applies as | Best for | Weak spot |
|---|---|---|---|
| This can | Thick bead from the nozzle | Tub, sink, and RV joints | Not designed to take paint |
| Flex Caulk | Bead, no gun | Trim you plan to paint | Different formula, read its label |
| Flex Seal spray | Aerosol coating | Roofs, gutters, foundations | No precise bead |
| Silicone sealant | Cartridge in a gun | Flat kitchen joints | Needs a steady hand |
The formula won’t run or drip on a vertical joint, which is where thin cartridge caulk tends to sag before it skins. That makes it easy to use for a DIY first-timer. The trade-off: the shade you buy is the shade you live with.
Is Flex Shot Good for Showers?
Yes, if the surface is clean and dry when you apply it. Once cured, the bead is waterproof and mildew resistant, so tub surrounds, bath seams, and drafty window frames are its usual jobs. The brand says it clings to almost any surface, and tile, glass, and wood are the typical cases.
Prep is where most failures start. Soap film, moisture, and old caulk residue cut adhesion, so a joint that looks fine on day one can lift at a corner later. In an emergency it can stop leaks instantly on a damp surface (the brand’s FAQ allows wet surfaces, just not standing water), but that bond is weaker than a dry one.
How Long Flex Shot Takes to Cure
According to the manufacturer, it skins over in about 20 minutes and fully cures in 24 to 48 hours, depending on humidity and bead thickness. Keep water off for the full window; early exposure is a common reason a fresh bead pulls away.
Laying a Clean Bead
- Check the temperature. The maker rates application from 0°F to 150°F surface temperature, so a sun-baked RV roof can fall outside the range.
- Strip and clean the joint; new sealant won’t bond well to old caulk.
- Fit the extension tube for tight spots. It can be cut to change bead width and reused, but don’t pull or yank it off.
- Press and move at a steady pace, then smooth the bead with a gloved finger before it skins.
Where to Buy It: Store by Store
Shelf colors vary by location, so check the listing for your zip code before driving over.
- Walmart: lists a 2-pack; third-party marketplace sellers ship slower than store stock.
- Target and Lowe’s: smaller stores sell out, so check stock online first.
- Home Depot and Lowe’s carry multi-can bundles; Ace Hardware and Menards list it too, with stock set store by store.
- Amazon: read the “sold by” field so you know whether the can ships from the brand or a reseller, and skim recent customer reviews.
- The official site: the place to look for bundles and the free extension tube for hard-to-reach repairs.
- Rural King and eBay: backups when shelves are empty.
Matching the Color to the Fixture
Pick the color first, because it can’t be painted later. Costs shift with color and promotions, so compare live listings.
- Clear: dries transparent, the safe default for glass and mixed-color tile. Check price on Amazon
- White: matches most tubs and trim. Check price on Amazon
- Black: blends into dark gutters, RV trim, and dirt-prone exterior gaps. Check price on Amazon
- Almond: suits beige fixtures and older almond-tone tubs.
- 2-pack bundle: worth it for a full bathroom, since a single can goes quickly on wide gaps. Shop the bundle
Start by matching the color to your fixture, then compare current Amazon pricing against the official site bundles. If you need Flex Shot today, Walmart or Lowe’s pickup is usually the fastest route; confirm your color is in stock before you go.
Reviewed by the allfromtv.com editorial team. Last updated: October 2026. For more as-seen-on-TV product guides, browse our pages on the George Foreman Grill, OxiClean stain remover, and the Total Gym home fitness system.
Frequently Asked Questions
Can you paint over it?
No. The manufacturer says it is not designed to be paintable, and paint won’t adhere well to the flexible surface. For a joint you plan to paint, the brand points buyers to Flex Caulk instead.
Can it be used on drinking water containers?
The brand’s FAQ says it has not been tested for potable water systems. Skip it for water tanks, food contact, and aquariums, and use a product certified for that job.
How long does a cured bead last?
The maker says it lasts for years without fading, drying out, or yellowing. Real-world life depends on prep and on how much movement and sun the joint sees.