You have booked new lines for your warehouse. Then someone asks about the floor. Is it ready? Often it is not. At City Linemarking, we use shot blasting and grinding to get a surface ready, and they are not the same thing. Here is how each one works, and how we decide between them.
Why Does Surface Preparation Matter Before Line Marking? Paint needs something to grip, plain and simple. A smooth, polished floor gives it nothing. Painting on it is a bit like painting on glass, and the lines can flake early. Old paint, dust and sealers cause the same trouble. Good preparation is what makes new lines last. It also protects your budget, because lines that peel in a year must be done twice. If you are unsure how your floor performs for grip, slip testing can confirm it first.
What Is Shot Blasting and How Does It Prepare a Floor? How Does the Shot Blasting Process Work? A machine throws thousands of tiny steel beads, as thin as 1mm, across the concrete. They strike the surface at speed. A thin layer of concrete comes off, and what is left is rougher. That rough texture is exactly what new paint wants. It can also remove unwanted markings in the same pass.
Is Shot Blasting Messy? Less than you would think. An attached vacuum collects the concrete dust. The beads are recycled and fed back into the machine, so very little waste is left behind.
What Is Grinding and When Do We Use It? Grinding, often called poly planing, wears paint away with a rotating machine. It is a versatile way to remove lines. Vacuum recovery keeps dust down, and we sweep or scrub the surface afterwards for the best result. We reach for it when the job is more targeted, such as a small patch or a tight corner.
Shot Blasting vs Grinding: Which One Do You Need? Both prepare a floor. They just go about it differently. Factor Shot blasting Grinding How it works Steel beads strike the floor A rotating machine wears the surface Main strength Rough profile for strong paint grip Precise paint removal in chosen areas Best for Large, smooth or polished floors Patches, edges and older markings Dust control Attached vacuum and recycled beads Vacuum recovery, then sweeping Also useful for Restoring skid resistance Clean paint removal before repainting
Every floor is different, so we inspect before we recommend, and we are happy to visit your site. Concrete age, paint type and finish all play a part.
Can One Floor Need Both Methods? Yes, and it happens more than you might expect. A large distribution centre may need shot blasting across the main aisles for grip. The same site may then need grinding along edges, around racking or at a small repair. Using both means each area gets the right treatment, and nothing is over-worked. Our team plans this before the machines arrive.
Which Method Suits Your Sydney Site? Here is how we usually think it through:
• Polished warehouse floor at Eastern Creek or Wetherill Park: shot blasting, for grip • Old lines to remove before a new layout: grinding or shot blasting, depending on paint • Car park at Parramatta: shot blasting can suit, and it can help restore skid resistance • Small patch near a loading dock: grinding, to keep the work contained
Water blasting and blackout paint are also options for removal. We explain those on our line marking removal page.
What Happens After the Surface Is Prepared? The floor is cleaned and checked. Then we mark the lines, using Dulux paints. If old markings were removed, a surface seal can help the patch blend into the floor around it. Then you get your site back, with crisp lines your staff and visitors can read at a glance.
What Mistakes Should You Avoid Before Line Marking? • Painting straight over a glossy or sealed floor • Skipping preparation to save a few dollars, then repainting within months • Picking a method without inspecting the surface first • Ignoring dust control in an operating warehouse
Why Choose City Linemarking for Surface Preparation? • Experience: 40+ years of combined experience and thousands of kilometres of shot blasting • Scale: 11,000+ projects and 9 active teams across NSW • Trust: RIAA member, CM3 certified and $20 million public liability cover • Flexibility: we work around your schedule, with 24/7 service available
Ready to Get Your Floor Line Marking Ready? Call us on (02) 8632 3198 or email info@citylinemarking.com.au. Send photos or plans through our quote form and we reply within two hours. We will tell you straight which method your floor needs, and quote it clearly.