A Simple Guide To Cleaning And Sealing A Small Slate Floor

If you are wondering how to clean and seal a slate floor, you have landed at the right place.

My minimum daily charge for slate cleaning makes cleaning small slate floors quite costly. Over the years,  I have helped a number of people to do small floors themselves. So, I decided to publish the advice on my blog as a reference for anyone who wants to try cleaning and sealing slate themselves.

There are many cleaners and sealers available. I have decided to use LTP products for this guide because they are good quality products and available throughout the country from Tile Giant stores, or online from LTP themselves or other suppliers.

If you have the desire, your knees and arms are OK, you can do the work yourself. I reckon 5 square metres is as much as a normal person will want to attempt. However, if you are particularly motivated, enjoy kneeling a lot, hard work and aching shoulders, then you can go as large as you want. So here we go.

I have added links to the cleaners, sealers and some equipment that is not readily available in the home.

If there is anything in this guide that you don’t understand, please feel free to use my simple contact form

How To Clean And Seal A Slate Floor

Slate Cleaning Chemicals

Slate Impregnating Sealers

Slate Surface Sealers

Slate Floor Wax

LTP Clearwax – est £21.00 for 1 litre


Personal Protection Equipment

Safety Equipment and Precautions

  1. Clear out area
    Remove all furniture, free-standing items and removable kitchen kick boards from the room.
  2. Tape skirting boards
    Use the 75mm masking tape to protect your skirting boards and the base of door architrave and static furniture
  3. Assemble equipment
    Get your equipment and chemicals together in a safe area as close to your room as possible
  4. Put on PPE
    Put on your gloves, goggles and knee pads.
  5. Dilute LTP Grimex into mop bucket – add chemical to water
    Always add chemicals to the water. Never add water to the chemicals, because the water can splash the chemicals out o the bucket onto your skin.
  6. Fill rinse bucket with water
  7. Shake Solvex
    LTP Solvex settles and separates after it has stood for only a few hours. So, before you open the container, give it a good shake to fully mix the components into a creamy consistency.
  8. Apply Solvex with the brush
    Apply the Solvex to 1 or 2 square metres maximum of the floor. As a rule of thumb, only apply the Solvex as far as you can reach on your knees.
  9. Leave Solvex for 15 minutes
    The Solvex needs tome to be absorbed into the old sealer and make it soft.
  10. Wet the Solvex With Some Grimex
    Use a sponge to wet out the Solvex.
  11. Agitate Solvex
    1. Hand Pad
      Use a black scrubbing pad to scrub the surface and remove the old sealer from the tile.
    2. Grout Brush
      Use the grout brush to scrub the grout to remove the old sealer.
  12. Remove Slurry
    Ideally, use a wet vac to vacuum away the slurry. If you don’t have a wet vacuum, then use a mop and bucket, or sponge and cloth.
  13. Repeat from 4 until got as clean as possible
    If there are layers of old sealer on your floor, you may need to repeat the process a number of times to remove all traces of the old sealer.
  14. Remove Tape
    Once you have removed all of the old Sealer from the tiles and grout, you can remove the masking tape and put it straight into a black bag for disposal.
  15. Remove Cleaning Materials
    Clean and remove all cleaning materials and equipment to a safe place.
  16. Leave overnight to Dry
    Some grout can be very porous, so it is better to leave your floor overnight, or even a couple of nights to dry ready for sealing.

Applying Slate Impregnating Sealer

If you are going to leave the floor with an Impregnating Sealer finish or you are going to apply a wax finish, you need to apply two or three coats of impregnating sealer.

  1. Get Sealing Materials and PPE
    Gather your sealing chemicals and equipment to a safe place, as close to the work area as possible.
  2. Put on PPE
    Put on your gloves and knee pads
  3. If Applying Colour Enhancing Impregnating Sealer
    Test the sealer to ensure it does not make the tiles too dark
    Use an inconspicuous area, e.g. under a kitchen unit and apply a small amount of sealer
    If the sealer makes the stone too dark, hiding the natural colours, then strip it off with some Solvex and rinse with some LTP Grimex and use the Standard Impregnating sealer. If the results are acceptable continue to apply the Impregnating sealer
  4. Apply The Impregnating Sealer
    Start at the far end of the room away from the door.
    Pour around a tablespoon of sealer onto the floor and massage it into the surface of the tiles and grout with a microfiber cloth, working on 1 square metre at a time.
    Work backwards to the door until the floor has been sealed.
    Do not allow the sealer to pool in the crevices.
    If there is any wet sealer remaining on the floor after 20 minutes, wipe it off with a clean dry cloth.
    Wait for the Sealer to dry for 30 minutes to an hour.

Applying Slate Surface Sealer

Apply Four To Six Coats Of Surface Sealer
Start at the far end of the room away from the door.
Pour around a tablespoon of Surface Sealer onto the floor and massage it into the surface of the tiles and grout with a microfiber cloth, working on 1 square metre at a time.
If the wet sealer looks milky, it is too thick, so spread it out more.
Work backwards to the door until the floor has been sealed.
Leave the floor overnight to dry

Applying Slate Surface Wax

Get Finishing Materials and PPE
Put on gloves and knee pads
Start at the far end of the room at the farthest point from the door
Working in approximately half a square metre squares, apply a thin coat of wax with the applicator cloth. Immediately buff to a low sheen with a clean buffing cloth. Continue until the floor has been waxed.

If after studying this guide, you prefer to call in Professional help, please don’t hesitate to use my simple contact form, I will be happy to help.