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Where to Apply
Heat Reflective & Waterproof Wall Putty
Star Cool Putty
A Smoother Wall Underneath Starts Every Great Paint Job
Star Cool Putty is a wall putty that goes on before your paint and quietly does more than most people expect from it. Alongside the smooth, paintable surface any good putty should give you, it's built to reflect heat and resist water right from the wall itself.
It's designed to sit underneath Star Cool Shield and our other premium finishes, giving them a stronger foundation to work from. Whether you're building fresh or repainting, it's meant for anyone who wants their paint job to look better and last longer, not just go on smoothly on day one.
Key Benefits of Star Cool Putty
- Smooth, Bright Finish — Levels out the wall and leaves a clean, white surface that's ready for paint.
- Reflects Heat From The Start — Built-in reflective minerals give the wall a cooler, brighter base before a single coat of paint goes on.
- Waterproof Layer — Resists water absorption, so the wall underneath stays protected from damp and moisture.
- Flexes With The Wall — Handles minor wall movement without cracking, so hairline cracks don't show through your paint.
- Uses Less Paint — A smooth, even surface means your paint goes further and colours come out truer.
- Works With Star Cool Shield — Purpose-built as the base coat beneath our heat-reflective roof and wall coatings.
GET A FREE QUOTE
Talk to an expert.
Our technical team will assess your requirement, recommend the right solution, and send you a detailed quote — at no cost.
An ESCO recognized leader in the industry
Request your free quote
Fill in the form and we will be in touch within 24 hours.
Request received!
Our team will review your details and get back to you within 24 hours.
The Problem
Why The Wall Underneath Your Paint Matters
Most putty is only built for one job — going on smooth. Star Cool Putty is built to solve all three of these problems before your paint ever goes on.
A Rough Wall Ruins A Good Paint Job
Uneven, porous walls soak up paint unevenly, leaving patchy colour and visible texture through even the best paint you can buy.
Ordinary Putty Cracks And Lets Water In
Standard putty isn't built to flex or resist moisture, so hairline cracks and damp patches often start right underneath the paint, not on top of it.
Heat-Reflective Paint Needs A Reflective Base
Even a good heat-reflective topcoat has to work harder if the wall underneath is already soaking up heat — the base matters just as much as what goes over it.
Benefits
6 Reasons Star Cool Putty Belongs Under Every Coat Of Paint
Star Cool Putty is a smooth, heat-reflective, waterproof wall putty built to do more than just prepare a wall for paint — it's the recommended foundation for Star Cool Shield and every premium finish that follows it.
Smooth, Paint-Ready Surface
Star Cool Putty levels out an uneven wall into a smooth, uniform surface, so your paint develops its full colour and finish without patchiness or visible texture underneath.
Reflects Heat From The Wall Up
Reflective minerals built into the putty brighten and cool the wall's base surface before painting, giving whatever topcoat follows a head start rather than leaving it to do all the work alone.
Waterproof Protection
The putty layer resists water absorption on its own, helping keep moisture from working its way into the wall from underneath your paint.
Flexes Instead Of Cracking
As the wall naturally moves with heat, cold, and age, Star Cool Putty moves with it, so minor movement doesn't turn into hairline cracks showing through your finished paint.
Uses Less Paint, Costs You Less
Because the surface doesn't soak up paint unevenly, you need less of it to get full, even coverage — a real saving across a whole house or building.
Built To Work With Star Cool Shield
Star Cool Putty is the recommended base coat for Star Cool Shield and our other premium finishes, so the whole wall system is working toward the same goal, not just the top layer.
How to Apply
Method of Application
Prepare & Repair The Wall
Clean the wall of dust, dirt, and any loose material, and fill larger cracks before you start. Make sure the surface is dry, or properly cured if it's new concrete or plaster.
Mix & Apply The First Coat
Mix the putty powder with clean water to a smooth, lump-free paste, and apply the first coat evenly with a putty knife or steel trowel, working it into the surface.
Second Coat & Sand Smooth
Once the first coat has dried, apply a second coat to finish levelling the surface. Let it dry fully, then sand it down until it's smooth and ready for paint.
Customer Stories
What Our Customers Say
FAQs
Frequently Asked Questions
What is Star Cool Putty?
It's a white cement-based wall putty that smooths and prepares a wall for painting, with reflective minerals and waterproofing built in — so it does more than a standard putty while still doing that basic job well.
How is it different from regular wall putty?
Regular putty is built for one thing — a smooth, paintable surface. Star Cool Putty adds heat reflection, water resistance, and flexibility against cracking on top of that same basic job.
Can I use it outdoors?
Yes, it's suitable for exterior walls and facades as well as interior walls and ceilings.
Does it work with Star Cool Shield?
Yes — it's built specifically to be the base coat underneath Star Cool Shield and our other premium topcoats, so the whole wall system performs better together.
How many coats do I need?
Two coats is typical for most walls, giving you a smooth, even, paint-ready finish.
Can it be sanded?
Yes, once it's fully dry, sand it down to get a smooth, uniform surface before painting.
Is it actually waterproof?
It resists water absorption better than an ordinary cement-based putty, which helps protect the wall underneath from damp and moisture-related damage over time.
Does it stop cracks from showing through?
It's formulated to flex with minor, everyday wall movement, so hairline cracks are less likely to telegraph through your finished paint. Larger structural cracks should still be repaired separately before applying the putty.
Does it really help keep the wall cooler?
It brightens and improves the reflectiveness of the wall itself, which gives a heat-reflective topcoat like Star Cool Shield a better base to work from. How much cooler your wall ends up depends on the whole system — the putty plus the paint above it — rather than the putty alone.
What walls can I use it on?
It works well on concrete, plastered walls, brick, and AAC blocks. For gypsum board or less common surfaces, check with our team first to confirm it's a good fit.
Do I need a professional to apply it?
Smaller touch-up jobs can be handled with care by most DIYers, but for full walls or larger buildings, a professional applicator will usually give you a more even, consistent finish.