The chemistry on the label decides where a caulk will shine and where it'll fail. Here's every formulation worth knowing, one spec sheet each. For the long version, read Federico's guide to caulk formulations.
Show me caulk that's:
The reliable workhorse
Interior trim, baseboards, crown molding, drywall gaps, anything you'll paint.
Showers, tubs, sinks, and exterior joints that move a lot.
Our picks: DAP Alex Plus Read the deep dive
The upgrade
Kitchen and bath trim, interior window frames, and humid rooms where you still want to paint.
Joints that sit in water, like the tub-to-tile seam.
Our picks: DAP Alex Plus Read the deep dive
The gold standard for wet work
Tubs, showers, sinks, countertops, glass, metal, and other slick, non-porous surfaces.
Anything you'll paint, and joints with old silicone residue you can't fully remove.
Acetoxy-cure silicones smell like vinegar while curing and can mark some metals and stone; neutral-cure formulas are gentler.
Our picks: GE Silicone 2 Kitchen & Bath, Gorilla 100% Silicone Read the deep dive
The exterior specialist
Concrete joints, driveways, masonry, foundations, and exterior joints between different materials.
Quick indoor jobs where you want water cleanup, and poorly ventilated rooms.
Some polyurethanes contain isocyanates. Ventilate, wear gloves, and read the safety sheet.
Our picks: Sikaflex-1a, Sikaflex Self-Leveling Read the deep dive
The premium all-rounder
Mixed materials (wood to metal to masonry to plastic), exterior trim, windows and doors, marine-ish jobs.
Tight budgets. It costs more.
Our picks: Soudal Fix ALL Read the deep dive
The flexible exterior performer
Exterior siding, trim, stucco hairlines, and the crown-molding crack that comes back every winter.
Anything that sits underwater.
Our picks: Sashco Big Stretch, DAP Dynaflex Ultra Read the deep dive
The roofing and flashing legend
Gutter seams, metal flashing, roofing details, and other metal-to-metal joints outdoors.
Indoor finish work. It's stringy, slow to cure, and smelly.
Our picks: DAP Butyl-Flex Read the deep dive
The quiet one
Soundproofing: drywall perimeters, electrical boxes, and gaps in shared walls, floors, and home theaters.
Wet areas and exposed finish surfaces. Hide it behind trim or drywall.
Our picks: OSI SC-175 Acoustical Read the deep dive
The emergency responder
Plugging active leaks and holes in concrete and masonry. It sets in minutes, even against running water.
Joints that move. It's rigid and will crack.
Not technically a caulk. It earns its spot on the shelf anyway.
Our picks: Quikrete Hydraulic Water-Stop Cement Read the deep dive
Variations built for one job, and they do it better than anything else on the shelf.
Pours into flat concrete joints and levels itself: driveways, garage floors, patios.
Has sand in it so it matches sanded grout at tile corners and changes of plane.
Built for asphalt, flashing, and UV; some can go on damp surfaces.
A solvent-based sealant that grips dirty, damp, or oily metal, vinyl, and masonry. Gutters love it.
Solvent-based, crystal clear, and very stretchy. Clearer than clear silicone.
Try: Sashco Lexel
Premium window, door, and siding sealants built for extreme weather and every substrate.
Try: OSI Quad Max
Seals penetrations through fire-rated walls and floors; some expand in a fire (intumescent). Code rules apply.
