When working on DIY projects or professional construction, durability and strength are everything. That’s where BondCrete comes in. It’s a versatile bonding agent widely used in Australia and beyond to improve adhesion between concrete, mortar, tiles, and even old surfaces. But many people are unsure about how to use BondCrete effectively. In this guide, we’ll break it down step by step, so even a beginner can get great results.
What Is BondCrete and Why Is It Useful?
BondCrete is a bonding and sealing agent made from a special polymer resin. Think of it as a “glue” that helps concrete or mortar stick to surfaces better. Normally, new concrete doesn’t bond well with old concrete, bricks, or smooth surfaces. Without help, it can crack or peel off. BondCrete solves this problem by acting as a bridge between surfaces.
Some popular uses of BondCrete include:
- Strengthening concrete mixes
- Helping render stick to walls
- Improving tile adhesion
- Repairing cracked or damaged concrete
- Sealing porous surfaces before painting
In short, BondCrete makes construction work stronger and longer-lasting.
How to Use BondCrete: Step-by-Step Guide
Using BondCrete is simple, but the right method depends on your project. Below are the most common applications:
1. As a Sealer
If you’re painting or rendering, BondCrete can be applied directly as a primer.
- Mix 1 part BondCrete with 4 parts water.
- Apply with a brush or roller onto the surface.
- Let it dry before applying paint, render, or tile adhesive.
This seals porous surfaces and ensures better adhesion.
2. As a Concrete Additive
This is the most common use when people search for how to use BondCrete as a concrete additive.
- Mix your concrete as usual (cement, sand, and water).
- Replace part of the water with BondCrete.
- A typical mix: 1 part BondCrete to 10 parts water.
This makes the concrete stronger, more flexible, and less likely to crack. It’s perfect for floors, driveways, or repair jobs.
3. For Repairs and Patching
BondCrete is ideal for fixing cracks or patching old concrete.
- Clean the damaged area.
- Paint on a BondCrete solution (1:4 with water).
- While it’s still tacky, apply your concrete or mortar mix.
This creates a firm bond and prevents the repair from lifting later.
4. For Tiling
Tiles often fail because adhesive doesn’t stick well. BondCrete solves this.
- Coat the surface with diluted BondCrete (1:4 with water).
- Let it become tacky before applying tile adhesive.
- You can also mix BondCrete directly into tile adhesive for extra grip.
Table: BondCrete Applications at a Glance
| Application | Mix Ratio | Result |
| Sealing porous walls | 1 part BondCrete : 4 parts water | Prevents absorption, better adhesion |
| Concrete additive | 1 part BondCrete : 10 parts water | Stronger, flexible concrete |
| Crack repair | Paint diluted BondCrete, then patch | Long-lasting repairs |
| Tiling primer | 1 part BondCrete : 4 parts water | Tiles bond firmly |
Tips for Getting the Best Results
- Clean surfaces first: Dust, oil, or paint will stop BondCrete from sticking.
- Don’t overuse it: Too much BondCrete can make mixes rubbery. Stick to recommended ratios.
- Work while tacky: For bonding coats, apply new material while the BondCrete layer is still slightly sticky.
- Store correctly: Keep the container sealed and away from extreme temperatures.
Final Thoughts
Learning how to use BondCrete properly can make the difference between a weak, short-lived project and a professional, durable finish. Whether you’re sealing, patching, tiling, or mixing concrete, BondCrete is a reliable helper that ensures stronger bonds and longer-lasting results.
FAQs About Using BondCrete
1. Can I use BondCrete outdoors?
Yes, BondCrete is weather-resistant and suitable for outdoor use like driveways, patios, and garden walls.
2. Do I need to dilute BondCrete every time?
Not always. For sealing, yes, but for mixing into concrete, you may use it directly (partially replacing water).
3. Is BondCrete waterproof?
BondCrete itself is not fully waterproof but helps surfaces resist moisture better. For full waterproofing, use a dedicated membrane.
4. Can BondCrete be painted over?
Absolutely. Once dry, BondCrete provides an excellent base for paints, adhesives, and renders.
5. Where can I buy BondCrete?
It’s widely available at major hardware stores like Bunnings and other reputable building suppliers.
