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Rapid set is a fast-setting 20kg concrete (25 MPa) for setting posts quickly — ideal for retaining wall steel posts, fence posts and letterboxes. Just add water in the hole; sets in minutes. Delivered Australia-wide by Retaining Walls Direct.
Written and product-checked by the Retaining Walls Direct team — supplying retaining wall and fencing materials across Australia. Last updated: June 2026.
The go-to for setting retaining wall steel posts when you want to keep moving — 25 MPa strength with a fast cure. For general non-urgent posts, our post mix is a budget alternative.
| Size | 20kg bag |
|---|---|
| Strength | 25 MPa |
| Set | Fast-setting (minutes) |
| Use | Retaining wall posts, fence posts, letterboxes |
| Brand | Retaining Walls Direct |
Get a quote or contact the team.
How fast does it set?
Within minutes — ideal for setting posts without long waits.
How many bags per post?
Allow 1–2 bags per post depending on hole size and depth.
Can you deliver to me?
We deliver across most of Australia. Send your details for a quote.
