Is this good for use in a bathroom? I have a gap between my shower wall and the tub, and want to put this in, then caulk over it.

That's a big gap for a shower but it should work and reduce the amount of caulk you use.

I have an open expansion joint in my driveway of 3/4"+. Will the 1" backer rod compress into this slightly over 3/4 " joint for a tight seal?

Joint Width Closed Cell Rod Size 1/16 - 3/16 " 1/4 " 3/16 - 1/4 " 3/8 " 1/4 - 3/8 " 1/2 " 5/16 - 1/2 " 5/8 " 7/16 - 5/8 " 3/4 " 1/2 to 3/4 " 7/8 " 11/16" - 7/8 " 1 " 13/16 - 1" 1-1/4 "

What are the benefits of closed cell versus regular backing rods? I have a few cracks between the concrete porch and the foundation.

Usually closed cell is used in exterior or moisture prone areas. They will provide more insulation and water proofing.

Can the caulk be painted/

This isn't caulk, its a filler that can fit in large gaps then caulked over. With that in mind, if you use paintable caulk along with the filler... good to go!

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🛠️ Seal like a pro, every time — don’t let gaps hold you back!

VERSATILE GREY HUE - Neutral color blends seamlessly with most surfaces for a clean finish
EFFORTLESS APPLICATION - Lightweight design reduces fatigue during prolonged use
EXTENDED PROJECT REACH - Generous 100-foot roll covers large areas without interruption
MAXIMIZE SEAL EFFICIENCY - Perfectly sized 3/8" width ensures optimal caulking depth and durability
TRUSTED BRAND RELIABILITY - Sashco’s industry-leading quality guarantees professional-grade results

The Sashco 30381 Pre-Caulking Filler Rope Backer Rod Roll offers a 100-foot length and 3/8" width in a lightweight, easy-to-handle grey roll. Designed to optimize caulking performance by providing a consistent backing for sealants, it ensures durable, professional-grade sealing for a variety of construction and repair projects.

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Manufacturer	Sashco
Brand	Sashco
Product Dimensions	33.02 x 33.02 x 12.7 cm; 22.68 Grams
Item model number	30381
Manufacturer Part Number	30381
Item Weight	22.6 g

Sashco30381 Pre-Caulking Filler Rope Backer Rod Roll, 100' Length x 3/8" Width, Grey

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