Domakihub Apply Epoxy Grout on a Shower Floor Without the Mess
A step-by-step guide to two-part epoxy grout for wet-area tiles — get it right the first time.
Reviewed by Domakihub home & decor pros · 2026-06-23 · 5 min read
Epoxy grout is the gold standard for shower floors in Greek holiday rentals and hotels: it resists mould, chemicals, and constant foot traffic far better than cement grout. The video above walks through a real installation on both a shower pan and shower walls, and the steps below give you the precise mixing ratios, working-time windows, and wash-off technique you need to replicate the result. Get the process wrong and you will spend hours scraping haze off your tiles; get it right and the grout lasts a decade without sealing.
Why Epoxy Grout Is Different From Cement Grout
Standard cement grout is a single-component powder you mix with water. Two-part epoxy grout consists of a resin and a hardener that, once combined, begin a chemical curing reaction you cannot stop. That reaction gives epoxy its superior bond and chemical resistance, but it also means you are working against a clock from the moment the two parts touch.
In warm Greek climates — particularly during summer when bathroom tiles can reach 30 °C or more — the pot life (working time) of epoxy grout shrinks noticeably. Most products give you 45 to 60 minutes at 20 °C; expect closer to 30 minutes on a hot August day. Planning your work area size around that window is not optional, it is the single biggest factor between a clean finish and a disaster.
Choosing the Right Epoxy Grout for a Shower Floor
Not all epoxy grouts are equal. For shower floors specifically, choose a product rated for joints of 2 mm to 12 mm, with a fine aggregate size that lets it pack into narrow tile joints without voids. Brands such as Mapei Kerapoxy, Litokol Starlike, and Weber.epox Flex are widely available through Greek tile merchants and are formulated for wet-area horizontal surfaces where standing water is a constant.
Check the manufacturer's colour chart under daylight before ordering. Epoxy grout colours appear slightly darker when cured than in the brochure swatch, and on a shower floor any colour mismatch between grout joints will be visible from a standing angle. Order 10 % more than your calculated coverage; partial mixing of a new unit mid-job to fill a shortfall is messy and introduces colour variation.
How to Apply Epoxy Grout on a Shower Floor
- 1
Prepare and clean the joints
Remove all spacers and vacuum out the joints thoroughly. Any cement, adhesive squeeze-up, or dust inside the joint will break the epoxy bond. Wipe tiles with a damp sponge and let them dry to just-damp — not wet, not bone dry. Epoxy grout bonds best to a slightly damp substrate, and a completely dry tile on a hot day will draw solvents out of the mix too fast.
- 2
Measure and mix the resin and hardener precisely
Mix Part A (resin) and Part B (hardener) in the ratio printed on the packaging — typically 2:1 or 3:1 by weight, not by eye. Use a kitchen scale accurate to 1 g, because an off-ratio mix will either stay tacky or cure too brittle. Pour Part B into Part A (not the reverse), and stir with a margin trowel or slow-speed drill paddle for a full two minutes, scraping the sides and base of the bucket. The mix should turn uniform in colour with no streaks before you touch a tile.
- 3
Work in small sections and pack joints firmly
Spread grout over no more than 0.5 square metres at a time on a shower floor. Use a hard rubber float held at 45 degrees to pack the mix diagonally across the joints — this prevents the float from dragging material back out. Press firmly; epoxy does not self-level into the joint the way cement grout can. On a textured or anti-slip shower floor tile, use a slightly softer float and work in multiple light passes rather than one heavy pass to avoid pulling aggregate out of the surface.
- 4
Remove excess before it sets
Working time is everything. As soon as a 0.5 m² section is packed, go back with a barely damp sponge and remove surface material. Rinse the sponge in clean water constantly and wring it almost dry before each wipe — excess water dilutes curing epoxy and weakens the joint surface. After the first sponge pass, switch to a clean microfibre cloth and buff in circular motions to lift the thin haze layer. Do not wait until the whole floor is grouted to start cleaning; epoxy haze that has cured even partially requires a dedicated acidic remover and significant effort.
- 5
Final wash and 24-hour cure
Once the entire floor is grouted and the initial wipe-down is done, prepare a bucket of warm water with a small amount of epoxy haze remover (follow the product dilution). Wipe the floor in overlapping passes with a clean sponge, turning it after every stroke. Allow the grout to cure undisturbed for at least 24 hours at room temperature before running water over it, and 72 hours before the shower is used normally. In a rental or hotel context, schedule the job at the start of a maintenance day so no guest can walk on the floor before it is fully hard.
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FAQ
- How long does epoxy grout last on a shower floor compared with cement grout?
- A correctly installed two-part epoxy grout on a shower floor typically lasts 15 to 20 years without needing to be resealed or replaced, provided the tiles themselves remain intact. Cement grout in the same wet-area application usually needs resealing every one to two years and full replacement within five to ten years in high-use environments like holiday rentals and hotels.
- Can I apply epoxy grout over old cement grout to refresh a shower floor?
- No. Epoxy grout cannot bond reliably over existing cement grout. The old grout must be removed to a depth of at least two-thirds of the tile thickness using a grout rake or oscillating tool, the joints must be vacuumed clean, and the surface must be free of sealers and residues before epoxy is applied. Skipping removal will result in adhesion failure and the new grout cracking out within months.
- What do I do if epoxy grout haze dries on my tiles before I can wipe it off?
- Cured epoxy haze requires a specialist acidic cleaner formulated for this purpose — products such as Fila Epoxy Off or Mapei Ultracare Epoxy Remover. Apply the product according to the instructions, let it dwell for the specified time, then scrub with a nylon brush and rinse. Do not use metal tools or abrasive pads on glazed tiles. Prevention is far easier: always clean in small sections within the pot life window, and never let more than 15 to 20 minutes pass between grouting and your first wipe on a warm day.