APPLICATION GUIDE · READY-MIX

How to use SUMO Ready-Mix Plaster

SUMO Ready-Mix Plaster gives smooth, compact internal and external walls with just added water. Here is the correct application method.

LEVEL

Intermediate

TIME

10–15 mm coat

STEPS

▶APPLICATION VIDEO — COMING SOON

SUMO Ready-Mix Plaster is a factory-blended plaster designed to give smooth, compact surfaces on internal and external walls — just add water. Consistent factory mixing means fewer cracks and less wastage than site-batched sand-cement plaster.

This guide covers preparing the wall, mixing and applying an even plaster coat.

BEFORE YOU START

What you’ll need

PLASTER40 kg bagReady Mix Plaster40 kg→

Plastering trowel, hawk, straightedge (darby)

Drill + paddle, clean water

THE METHOD

Step by step

Prepare and dampen the wall

The masonry must be sound and clean. Rake joints, remove dust, and dampen the wall evenly so it does not pull water from the plaster too fast.

PRO TIPEven dampening prevents fast drying and the shrinkage cracks that come with it.

Mix to a workable consistency

Add SUMO Ready-Mix Plaster to clean water and mix to a smooth, workable, lump-free mortar. Let it stand briefly and remix. Mix batches you can apply before they stiffen.

PLASTERPRODUCT USED IN THIS STEPReady Mix Plaster40 kg→

Apply an even coat

Apply the plaster with a trowel to the required thickness in a consistent coat, pressing it well into the surface. For thicker builds, apply in layers rather than one heavy coat.

WATCH OUTVery thick single coats slump and crack. Build thickness in layers where needed.

Rule off and level

Rule off with a straightedge to a flat, true surface, filling hollows as you go, then float to the finish you need.

Cure the plaster

Keep the plaster damp-cured for the recommended period so it gains strength without drying-shrinkage cracks.

AVOID THESE

What to avoid

!Dry, dusty background

Plaster debonds from dusty or bone-dry walls. Clean and dampen first.

!One thick coat

Heavy coats slump and crack — build up in layers.

!No curing

Fast drying causes shrinkage cracks. Keep it damp-cured.

QUESTIONS

FAQ

What is SUMO Ready-Mix Plaster?+

A factory-blended plaster for smooth, compact internal and external walls — just add water, for a consistent, low-crack, low-waste finish.

Can it be used outside?+

Yes — it is designed for both internal and external wall plastering.

How thick can I apply it?+

Apply to the recommended thickness; for thicker builds, apply in layers rather than one heavy coat to avoid slumping and cracking.

THE KIT

Products used in this guide

PLASTERSUMO PRODUCTReady Mix Plaster40 kg→WALL PUTTYSUMO PRODUCTWall Putty40 kg→FLOORSCREEDSUMO PRODUCTFloorscreed40 kg→SEALCRETESUMO PRODUCTAcrylic Waterproofing Liquid1 kg→

NOT SURE ON YOUR JOB?

Send us your substrate and tile size — our technical team will confirm the exact method.

Read the datasheet →