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Limeburn – what is it and how can painters prevent it?

From the Resene Trade blog

There's more to being a painter than slapping on a few coats of paint and calling it a day – any professional knows just how much work goes into the job and how much care has to be taken for the good of the finished project.


Lime burn is a real condition for paint, caused by the breakdown of paint binder from the alkalinity levels in fresh masonry, leaving colour loss and deterioration of the paint.

The problem with masonry is that with high levels of calcium hydroxide (lime) that react with the carbon dioxide in the air, it can attack the binder and destroy the paint job.

Dealing with lime burn

The good news is that lime burn can be avoided with Resene Limelock, which locks in the lime present in the substrate so that it can't react with carbon dioxide in the air therefore ruin the paint.

Usually fresh masonry will need at least 30 days to 'cure' to allow for the chemical reactions to take place before a top coat of paint is applied.

As is often the case however, you just can't wait that long and need a faster fix.

With Resene Limelock you won't need to do any extra surface preparation on a new surface before applying, although some work may be required if the surface is weathered or aged.

It can be applied straight onto fresh masonry and only requires one coat, then you can proceed to paint with an overcoat as per usual.

March 3, 2014

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