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Sealing Planter Boxes

Make sure your planter box/garden bed or plant pot is clean and dry. Also make sure there isn’t any grease or organic matter on the area or areas you wish to fix. 

Step One
Planter Box Grinded back.
Step Two

When it’s time to get out the rubber, start by focusing on the possible problem areas those will be any cracks, joints or penetrations.

Paint a Thick Layer of Liquid Rubber High Build on these spots, followed by a layer of geofrabric.

Its ok to layer over layer to cover up winkles but just remmeber if its really thick, it will take longer to dry.

It's quite common for us to cover the whole planter box with the geofabric, this will use more more rubber but it will also dramatically strengthen the membrane from wear/tear and possible damage from objects.

Important tip:

Make sure you don’t leave any bubbles or winkles in the fabric for water to escape your want it to be smooth and flat so cut and fold it like your making origami the better it looks the better it should seal.

Step Three

Paint the geofabric in and a small area around. This will mean it has a large area to lock to the ground and won’t come off and it will create a watertight seal and if your painting the whole planter box just fill in all the planter walls and floor with rubber after that it’s just a matter of leaving to dry and your planter is ready to go.

Step Two Geofabric and High Build
Some Helpful info:


  • Using a 230mm Roller and dipping directly into the bucket can make things quicker and easier too.


  • When painting geofabric start from the middle and brush out towards the edge so to stop the fabric pulling up with the brush.


  • Bubbling can be a common problem when coating concrete due to all the capillaries in the concrete holding air. it is always advisable to use a water based sealer for best results or alternately you can use some Liquid Rubber High Build (Instant Set works better) and paint it very thin with a roller and work it into the concrete to fill up all those capillaries leave to dry before applying a main coat ( this can be done more than once to be safe).

Step Four

Now its sealed, its time to add the protection this will ensure you don't damage the meanwhile or after you've filled it with soil

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