How to avoid lap lines and roller marks while applying concrete sealers?

The two most common problems with sealer application are ‘lap lines’ and ‘roller marks’. The lap lines are caused by the ‘push-pull’ applicators and roller marks are caused obviously by ‘rollers’. Rollers are used for lower-viscosity concrete sealers while push-pull applicators are used for higher-viscosity sealers or coatings. The roller marks or lap lines can show up with any sealer or coating and on any surface or substrate. These are created by physical forces exerted on the liquid sealer during application.

How to avoid them –

a. Do not overwork the roller – If you over work the roller, the roller lines are bound show up. A light touch and light thin coats are the best approach.

Spray application is the best, as it eliminates the ‘overworking’ aspect and pretty much guarantees a uniform application without roller marks.

b. Do not overload the roller – Overloading the roller with the material will cause roller marks and if using a push-pull applicator, pour the sealer directly onto the substrate and push and pull until a thin film has been achieved.

c. Porosity of the surface – If the surface that is being sealed is porous, it is best to spray the sealer. A roller or push-pull applicator is bound to leave a roller line or lap mark.

d. Maintain wet edge – Each subsequent pass of a roller or applicator should cover 2 or 3 inches in the previous pass. This assures that any sealer build up on the previous edge is knocked down, eliminating a lap line.

Using the right applicator and good application control are keys to eliminating roller marks or lap lines for future sealer projects. A light touch slow and easy on the roller or applicator, and not overworking the sealer or coating leaves a uniformly sealed surface.

Please watch the video clip showing the application of water based acrylic, epoxy and polyurethane sealers.

You might also be interested in…

The Importance of Seamless Flooring in Medical Offices and Hospitals

Seamless flooring systems based on epoxy, polyurethane, MMA and/or polyaspartic poyurea are a great choice for a Medical Office or Hospital. In a hospital or medical office, the floor is ...

Read more

Best Concrete Sealers - Acrylic, Epoxy and Polyurethane

Whether having new concrete floors installed in a residential home or large business setting, quality products and proper installation are vital. To ensure success, specific steps are followed, one being ...

Read more

Metallic epoxy coating used at New World Stages, NYC

New World Stages_Before New World Stages is an award winning state-of-the-art theatrical venue just west of Time Square. It is constructed on (and under) the site of the former Madison ...

Read more

Methyl Methacrylate (MMA) Resin-based Flooring Systems

When you’re talking about floors, MMA does not refer to “mixed martial arts” but it does mean a flooring system that is just as tough. Methyl Methacrylate resin based flooring systems offer that are ...

Read more