Sydney's Local Hardware Store Since 1923

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Caulking and sealing products — silicone sealants, gap fillers, expanding foam and caulking tools at Double Bay Hardware

Caulking & Sealing

(71 products)

Double Bay Hardware stocks a comprehensive range of caulking and sealing products for trade professionals and DIY enthusiasts across Australia. Our range covers silicone sealants, gap fillers, expanding foam, wood fillers, polymer repair compounds, roof and gutter sealants, wet area sealants, and caulking tools — from trusted brands including Selleys, Sika, Soudal, H.B. Fuller, GSA, Timber Mate, Turbo, and Uni-Pro.

Categories Include

  • Silicone Sealants – General purpose, wet area, glass, and multipurpose co-polymer sealants in clear and white from Selleys, GSA, and Sika, suitable for metal, glass, concrete, ceramics, and plumbing applications
  • Gap Fillers – Interior multipurpose gap fillers from Selleys for filling cracks and gaps in plaster, cornice, skirting boards, and architraves before painting
  • Spakfilla & Wall Fillers – Ready-to-use Selleys Spakfilla in rapid and heavy-duty formulas for repairing holes and imperfections in plaster and drywall
  • Wood Fillers – Water-based wood fillers from Timber Mate in white and walnut, and Selleys Plastic Wood in maple, for repairing timber surfaces, furniture, and floors
  • Expanding Foam – Soudal gap-filling expanding foam for sealing large gaps, voids, and penetrations in walls, floors, and around pipes and frames
  • Polymer & Epoxy Repair Compounds – Selleys Knead It multipurpose and aqua polymer repair compounds for bonding and repairing metal, ceramic, timber, and wet or submerged surfaces
  • Roof & Gutter Sealants – H.B. Fuller FulaSeal 700 roof and gutter sealant for weatherproof sealing of gutters, flashings, and roofing joints
  • Caulking Guns – Skeleton and Handy Hardware caulking guns in 225–230mm for applying cartridge sealants cleanly and efficiently
  • Caulking Tools & Finishing Sets – Uni-Pro caulk finishing sets and 5-in-1 caulking tools for smoothing, shaping, and finishing sealant beads to a professional result

All caulking and sealing products are selected for quality and suitability for Australian building conditions. Our team can help you choose the right sealant type, substrate compatibility, and finish for your project.

Frequently Asked Questions

What types of caulking and sealing products do you sell?

We stock silicone sealants, gap fillers, spakfilla and wall fillers, wood fillers, expanding foam, polymer and epoxy repair compounds, roof and gutter sealants, caulking guns, and caulking finishing tools. Brands include Selleys, Sika, Soudal, H.B. Fuller, GSA, Timber Mate, Turbo, and Uni-Pro.

What is the difference between a silicone sealant and a gap filler?

Silicone sealants are flexible, waterproof, and ideal for wet areas, glass, metal, and exterior joints that experience movement. Gap fillers (such as Selleys No More Gaps) are paintable, water-based products designed for interior gaps in plaster, cornice, and skirting boards where flexibility and waterproofing are less critical.

Which sealant should I use for a bathroom or wet area?

For bathrooms and wet areas, use a dedicated wet area silicone sealant such as Selleys Wet Area Silicone Sealant or GSA Wet Area Plumbing Silicone. These are formulated to resist mould and moisture in high-humidity environments around baths, showers, basins, and tiles.

Do you sell expanding foam for large gaps?

Yes. We stock Soudal Gap Filling Expanding Foam 500ml, which is ideal for filling large gaps, voids, and penetrations around pipes, window frames, door frames, and structural openings. It expands to fill irregular shapes and sets firm for cutting and painting.

Do you sell caulking guns and application tools?

Yes. We stock Skeleton and Handy Hardware caulking guns (225–230mm) for applying cartridge sealants, as well as Uni-Pro caulk finishing sets and 5-in-1 caulking tools for smoothing and finishing sealant beads to a professional result.

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Let customers speak for us

from 1237 reviews
Anonymous
I was thrilled to finda pedometer so close to

I was thrilled to find a pedometer so close to home! And to have double bay hardware deliver it to me 2 days later! Thank you very much.

Mini Portable Pedometer LCD Step Counter
Mini Portable Pedometer LCD Step Counter
Anonymous
DBH Delivered

Order, delivery and notifications were good.

RAVEN Rubber Window Squeegee 400mm H225
RAVEN Rubber Window Squeegee 400mm H225
LG
Exactly what I needed, fast and safe shipping

Exactly what I needed, fast and safe shipping.

OSRAM DULUX D/E Compact Fluorescent Light Bulb G24q-2 18W/840
OSRAM DULUX D/E Compact Fluorescent Light Bulb G24q-2 18W/840
sailing0530 hotmail
so

so good

SANSAI Night Light Replacement Light Bulb E12 240V 7W GL-AE1207
SANSAI Night Light Replacement Light Bulb E12 240V 7W GL-AE1207
Sue Morey

i have used it for many years

Antiquax Original Wax Polish Aerosol 250ml ANTQWA
Antiquax Original Wax Polish Aerosol 250ml ANTQWA
Evelin Hegyesi
Goldair 1200W radiant heater

This is an excellent heater. It’s practical, lightweight, easy to use and gives instant warmth as well as being affordable. The level of heat can be adjusted to one, two or all three bars. I highly recommended it. Fan from Double Bay Hardware was incredibly helpful and accomodating. Wonderful customer service. Cheers, Evelin.

Goldair 1200W 3 Bar Radiant Heater GIR180
Goldair 1200W 3 Bar Radiant Heater GIR180
Jody

Have only used 1, the other is spare as it is difficult to find these globes & the other one will probably blow any day now as they are connected to the same switch. Works as expected.

OSRAM Smartlux T5 Fluorescent Tube 21W/840 SL 850mm
OSRAM Smartlux T5 Fluorescent Tube 21W/840 SL 850mm
Peter Davis
Hard to Get Part

These tubes are hard to find. Double bay had them in stock and despatched quickly. Item was as decribed and fitted and worked fine.

nls T5 Circular Fluorescent G10q 240V 55W/865 296mm
nls T5 Circular Fluorescent G10q 240V 55W/865 296mm
Arthur Carr
SIGHT

DELIVERY ON TIME, CAREFULL ATTENTION GIVEN TO PACKAGEING!

Philips PL-S 2Pins Compact Fluorescent Light Bulb G23 11W/840/2P
Philips PL-S 2Pins Compact Fluorescent Light Bulb G23 11W/840/2P
James
Very Handy Lightweight Rails

These rails are great for camper vans or light duties. Can handle a towel with no problems. Easy to install and nice and sturdy. Delivered fast too.

L T Williams Towel Rail Chrome Plated Steel 38cm 1242
L T Williams Towel Rail Chrome Plated Steel 38cm 1242
Yvonne Davies
Great bags

Fits kitchen bin well and drawstrings allow rubbish to be well contained.

Household Kitchen Tidy Bags With Draw-Tape Small 12L 45x54cm 25Pcs
Household Kitchen Tidy Bags With Draw-Tape Small 12L 45x54cm 25Pcs
Kerry Hawking
Prompt and efficient service

Great Service

Philips Double Ended Tubular Strip Light S15 60W Clear 284mm
Philips Double Ended Tubular Strip Light S15 60W Clear 284mm
Suzi
Silver polish cloth

Helpful cloth to keep your silverware from oxidising too much.

Goddards Long Term Silver Polish Cloth
Goddards Long Term Silver Polish Cloth
Mic Millist

I ordered two small light bulbs on line as nobody seemed to stock the ones I needed..
They arrived in a day!
It is so gratifying to find a hardware store that genuinely cares about its customers.
I am also glad to see so many positive reviews.
I live in Crows Nest but I will now make a trip to Double Bay just to check these guys out.
I noticed a review by a customer saying that the prices are too high and to go to Rose Bay Bunnings.
O.K. go to Bunnings and try and get some really knowledgeable advice.
Chances are YOU WON'T!
I would rather deal with genuine people in this world who KNOW what they are talking about and that goes for ALL businesses..

Double Bay Hardware
marie pepper
EXCELLENT

I AM OVER JOYED WITH THIS PORDUCT IT IS OUTSTANDING AN MEETS MY EVERY NEED = I WILL DEFINATLY PURCHASE FROM THIS SELLER AGAIN WHEN THE NEED ARISES === T HANK YOU

PHILIPS PAR38E Infrared Light Bulb for Healthcare E27 230V 150W
PHILIPS PAR38E Infrared Light Bulb for Healthcare E27 230V 150W

What customers think about the store

Double Bay Hardware excels in stocking hard-to-find specialty items, particularly light bulbs and cleaning products. Customers appreciate fast delivery, helpful staff, and knowledgeable service. The store successfully fills niche market needs with quality prod...

AI-generated from customer reviews.

Bulbs Delivery Product Service
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