Asphalt Crack Sealer
Asphalt crack sealer products and advice is available from most local home centers or hardware stores.
Of those, most are water-based emulsions containing water, clay fillers, latex, polymers, additives and either coal tar or asphalt.
These two options (coal tar and asphalt based), have very different profiles in terms of price, environmental friendliness, and durability.
Of the two coal tar products are more popular, but asphalt based products are rapidly increasing in popularity, and not only because they are much friendlier to the environment.
According to majority of the sealer manufacturers, coal tar sealers are still more durable despite advances in asphalt based sealers, and much more resistant to oil or gasoline penetration.
Asphalt-based sealcoating products are more environmentally friendly, due to the fact that they don't emit high levels of volatile organic compounds (VOCs) like the petroleum-based products do.
Asphalt-based products are also less of a skin irritant but more pricey due to the fact that they need extra polymers and other additives to increase durability.
Both are available in plain and filled-sealer formulas.
Of these, filled sealers contain sand or other solids to fill small cracks and holes.
As a general rule from the manufacturers, the more solids are in the formula, the better the sealer quality and the more expensive it is likely to be
However, you will have hard time in comparing the additives and solids used in different sealers from different manufacturers as the formulas used are not revealed by the manufacturers.
One way to estimate quality, one that you should approach with caution, is by comparing the warranties given. The longer the warranty, generally, the more likely it is that it contains more solids and is thus of higher quality.
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