Not all bathroom caulk is the same. The tube in the plumbing aisle that’s $2 cheaper will look fine for six months and turn black and peel before you know it. Here’s what actually holds up long-term. If you’re re-caulking after a refinishing job, the complete DIY bathtub refinishing guide covers when to caulk in the overall sequence.

Silicone vs. Latex — Which Do You Need?

This is the first choice to make.

100% Silicone

  • Best flexibility and durability
  • Doesn’t shrink or crack
  • Mold-resistant by nature
  • Lasts 10–20 years when properly applied
  • Cannot be painted over
  • Requires solvent (isopropyl alcohol) to clean fresh product from surfaces
  • Harder to tool smoothly

Siliconized Latex / Latex with Silicone

  • Easier to apply and smooth
  • Cleans up with water
  • Can be painted
  • Shorter lifespan (3–7 years)
  • Some are mold-resistant, some aren’t — check the label

For bathtub and shower use, 100% silicone is the right choice for the main tub-to-wall joint. It’s the joint that sees the most movement, the most water, and needs the longest service life. On a refinished tub specifically, caulk choice matters even more — the coating edge at that joint needs to stay sealed to prevent water intrusion that can undermine the finish.

For smaller gaps (around a soap dish, around fixtures), siliconized latex is fine.

Best Caulk by Use Case

Best Overall: GE Supreme Silicone Kitchen & Bath

GE Supreme Silicone is the standard recommendation from professional tile and plumbing contractors. 100% silicone, good color selection, excellent adhesion, mold inhibitor built in.

Available in white, almond, biscuit, and clear. Good for standard tub-to-tile and tub-to-wall joints.

Best for Refinished Tubs: DAP Kwik Seal Plus

DAP Kwik Seal Plus is a siliconized latex that adheres well to painted and coated surfaces. On a refinished tub, pure silicone can sometimes have adhesion issues if the coating isn’t fully cured — DAP Kwik Seal Plus bonds more reliably to polymer coatings.

It’s not as durable as pure silicone long-term, but it’s a better match for refinished surfaces.

Best for High-Mold Areas: GE Mold-Resistant Silicone

GE Advanced Silicone 2 has an enhanced mold inhibitor and is rated for high-humidity environments. If your bathroom has poor ventilation and you’ve fought mold before, this is worth the extra dollar or two.

Best Budget: Red Devil Duraguard Kitchen & Bath

Red Devil DuraGuard — siliconized acrylic, solid mid-range performance, easier to apply than pure silicone. Fine for lower-traffic bathrooms.

Best Clear Caulk: 100% Silicone in Clear

For joints where you don’t want visible caulk — between clear glass shower panels, around chrome fixtures — a 100% silicone in clear like GE All Purpose Silicone stays transparent and flexible for years.

What to Avoid

Dollar store / off-brand caulk — Hardness variation, poor adhesion, molds fast. The 3-pack of mystery caulk isn’t a deal.

Paintable latex for bathroom joints — It will crack, shrink, and absorb water within a year in a constantly wet environment.

“Tub and tile” caulk without specifying silicone — Marketing language without chemistry specifics. Check the label for “100% silicone” or “siliconized.”

How Much Do You Need?

A standard tub perimeter (the joint around all four sides of a bathtub) uses roughly one tube of caulk. Buy two — one to do the job, one for touch-ups and the inevitable mis-starts. Before applying anything, make sure the old caulk is fully removed — how to remove bathtub caulk walks through that process completely.

A single tube (typically 5.5–10.6 oz) is enough for most single-tub applications.

Quick Comparison

ProductTypeBest ForLifespan
GE Supreme Silicone100% SiliconeGeneral use, standard tubs10–20 years
GE Advanced Silicone 2100% SiliconeHigh-humidity bathrooms10–20 years
DAP Kwik Seal PlusSiliconized LatexRefinished tubs5–7 years
Red Devil DuraGuardSiliconized AcrylicBudget, lower-traffic baths3–5 years

Ready to Apply?

→ How to apply bathtub caulk — step-by-step guide → How to remove old caulk first