Why does my concrete look “blotchy” (inconsistent gloss) after applying a W. R. MEADOWS concrete curing and sealing compound or concrete sealer?
You’ve just sealed your concrete hardscape and it appears “blotchy” or it isn’t “glossy” over the entire slab. Typically, when we see a floor or exterior slab that is blotchy or not uniform in gloss, it’s caused by; (or a combination of the issues listed below):
- Poor sealer application technique.
- Not enough sealer applied.
- Varying absorption rates of the concrete (some areas are by concrete’s nature more porous than others)
If you were to look at a concrete slab under a microscope, you would find that it consists of an almost infinite number of “hills and valleys.” The final profile on the surface of the slab is directly related to the finish. A smoother finish will produce less hills and valleys, while a broomed or rough finish can resemble the Grand Canyon.
When applying a concrete sealer, the sealer will find its way into the valleys. If the sealer isn’t applied uniformly or if not enough sealer is applied, the slab will appear blotchy when dry. This is caused by the sealer being present in the valleys, but not remaining up on top of the hills.
A portion of the sealer or cure and seal is also absorbed into the pores of the concrete, as this porosity varies by concrete’s nature, you will have varying amounts of “film” build in different areas.
The solution is to make sure the sealer is applied in a uniform manner AND to apply multiple, light coats of sealer, if necessary, to obtain uniform gloss. The key is light coats. Applying heavy coats of sealer will create even more headaches.
W. R. MEADOWS sealers are specifically formulated to help produce the most uniform films possible. Unfortunately, even a premium-grade sealer will not compensate for poor application techniques, and/or insufficient product applied to the concrete.
Of course, W. R. MEADOWS is happy to help in all cases. If you have a specific question about application techniques, please contact your local sales office at (800) 342-5976 or email [email protected].
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