Line Marking Midland WA

The Midland area around the old railway workshop precinct has a mix of heritage concrete structures and new development. We marked a carpark adjacent to one of the older surfaces — a retained concrete area from the railway era. Pressure-washed, moisture-tested, applied primer. The primer took uneven in a visible, mottled pattern across the surface. Sections over the local red gum aggregate particles absorbed the primer rapidly; sections between particles absorbed slowly. The resulting topcoat had variable film build and uneven sheen.

It wasn't a failure — the adhesion was acceptable everywhere — but the aesthetic quality was visibly below what we'd normally produce. We hadn't identified the aggregate type as a variable before quoting. Red gum and jarrah timber-derived aggregates in heritage-era Perth concrete are highly absorbent and create uneven absorption patterns that affect primer take-up. An additional primer pass at reduced dilution — a penetrating seal coat before the main primer — produces a uniform surface for the topcoat.

We went back and applied the additional coat at no charge, and the finished result was uniform. The lesson: heritage-era concrete in the Midland precinct needs a substrate assessment that asks about aggregate type, not just moisture and contamination. Jarrah and red gum aggregate concrete is local to the Swan Valley and Midland area — you won't encounter it in Welshpool or Kewdale.

Midland is Perth's eastern hub — St John of God Midland Health Campus, the Midland Gate Shopping Centre, the heritage railway workshop precinct, and growing logistics east of the city. Main Roads WA approved. We've been completing Midland health, commercial, and industrial marking since 2009.