Elastomeric vs Acrylic
Both are exterior coatings over prepared render. Elastomeric is applied at higher film build and stretches to bridge hairline cracks; acrylic is thinner, cheaper and has good colour retention but limited crack bridging. If the elevation has live hairline cracking, only one of them is actually doing the job.
The differences that actually decide it
| Criterion | Elastomeric | Acrylic |
|---|---|---|
| Film thickness | 0.3-0.6 mm | 0.15-0.3 mm |
| Crack bridging | Good | Minimal |
| Elongation | High | Low |
| Colour retention | Good | Very good |
| Coats required | 2-3 | 2 |
| Dirt pick-up | Higher — softer film | Lower |
| Relative cost | Higher | Lower |
Which one, and when
Choose Elastomeric
- Elevations with live hairline cracking
- Buildings with visible thermal movement
- Where the render has been repaired and fine cracking is expected
Choose Acrylic
- Sound, stable substrates with no live cracking
- Where colour retention is the priority
- Budget-constrained repainting on a good substrate
What goes wrong most often
Buying elastomeric and then applying it thin to cover more area. Below its specified film thickness it bridges nothing, and you have paid the premium for a property you did not get.
Other decisions worth getting right
- APP membrane vs SBS membrane
Both are modified bitumen sheets applied by torch.
- Brick bat coba vs Torch-on membrane
Coba is a thick cementitious build-up that creates the fall, insulates the slab and forms the barrier all at once.
- Polyurea vs Polyurethane coating
Polyurea is spray-applied with heated plural-component equipment and gels in seconds, giving a seamless high-build film that can be walked on within the hour.
- PU injection vs Epoxy injection
The deciding question is whether the crack is moving and whether it is wet.
- HDPE membrane vs Bentonite
Both are pre-applied below-grade systems.
- Cementitious coating vs Liquid membrane
Cementitious coatings are rigid, breathable and bond well to damp concrete — which is why they suit tanks and internal tanking.
- China mosaic vs Shahabad ladi
Both are protective finishes laid over a completed terrace waterproofing layer — neither is a barrier in itself.
- Positive side (external) vs Negative side (internal)
Positive-side waterproofing sits on the face the water arrives from, so water pressure pushes it against the structure.
- Crystalline vs Surface coating
Crystalline systems penetrate concrete and grow crystals inside its capillaries, becoming part of the concrete.
Elastomeric vs Acrylic — questions we get asked
Elastomeric or Acrylic — which is better?
Neither, in the abstract. Both are exterior coatings over prepared render. Elastomeric is applied at higher film build and stretches to bridge hairline cracks; acrylic is thinner, cheaper and has good colour retention but limited crack bridging. If the elevation has live hairline cracking, only one of them is actually doing the job. The decision is made by the duty the system has to perform, not by which product has the better datasheet.
When should I choose Elastomeric?
Elevations with live hairline cracking. Buildings with visible thermal movement. Where the render has been repaired and fine cracking is expected.
When should I choose Acrylic?
Sound, stable substrates with no live cracking. Where colour retention is the priority. Budget-constrained repainting on a good substrate.
What is the most common mistake people make here?
Buying elastomeric and then applying it thin to cover more area. Below its specified film thickness it bridges nothing, and you have paid the premium for a property you did not get.
Not sure which your building needs?
That is what the inspection is for. An engineer looks at the actual substrate, exposure and movement, then tells you which system fits and why the other one does not.
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