Will 1 tube seal around a standard size bathtub?

Thank you for your question. We recommend using the 10.1 oz tube for your tub to be sure you have enough. One 10.1 ounce tube is enough to caulk two bathtubs and one sink. The squeeze tube is only 2.8 oz..

Is this low modulus silocone?

It worked well in my bathroom. My application does not require expansion. Think sink and shower.

Can this be used on a hairline crack in the bottom of a bathtub?

You shouldn't even be using that tub if it has a hair line crack. The tub needs to be replaced. I'm assuming that the tub in fiberglass. It has probably developed a hair line crack because it was not installed properly to begin with. The area beneath the tub should be filled with spray foam insulation to provide support for the tub. Some builders even use sand, though I would not recommend that. I speak from first hand experience. We had purchased a house that was about 15 years old. There was a shower and whirlpool in the master bath and a fiberglass tub in the hall bath. My husband gets up really early, so he would shower in the hall bath to avoid waking me. He a big guy, not obese by any means, just a big guy...about 200 lbs. He was shower one morning and the bottom of the tub just gave way and he was standing about 4 " lower. The builder hadn't put anything under the tub for support. I guess the tub had probably been used previously for bathing children. It was a mess! It this tub had been upstairs there would have been major damage and a much larger cost for repairs.

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🔧 Seal Smart, Live Confident: The Last Caulk You’ll Ever Need

LIFETIME CONFIDENCE - Backed by a lifetime guarantee, this caulk is the last seal you’ll ever need for your home.
METAL FRIENDLY FINISH - Won't discolor premium metals like chrome, bronze, or nickel—keep your fixtures looking flawless.
FLEXIBILITY THAT LASTS - Experience 40% more flexibility and 5x stronger adhesion that moves with your surfaces—no cracks, no shrinkage.
FAST TRACK YOUR PROJECTS - Ready for water exposure in just 30 minutes, so you can finish faster and get back to living.
ULTIMATE WATERPROOF DEFENSE - Protect your kitchen and bath from water damage with a 100% silicone seal that never lets moisture in.

The GEGE281 Silicone 2 Kitchen and Bath Caulk is a premium 2.8 oz. white silicone sealant designed for ultimate waterproof protection and durability. It offers 40% more flexibility and 5x stronger adhesion, is water-ready in 30 minutes, and resists shrinkage and cracking under temperature changes. Its neutral-cure, low-odor formula won’t discolor high-end metal finishes and comes with a lifetime guarantee, making it ideal for professional-quality kitchen and bath sealing.

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Product Dimensions	5.23 x 18.9 x 2.54 cm; 34.02 g
Part number	GE281
Material type	Silicone
Manufacturer	MOMENTIVE PERFORMACE
Item model number	281
ASIN	B016TQF65M

GEGE281 Silicone 2 Kitchen and Bath Caulk 2.8 oz. Squeeze White

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