White Stains on Freshly Sealed Asphalt

June 15, 2017

White Stains on Freshly Sealed Asphalt

It's not uncommon to see white or even rust colored stains on a freshly sealed asphalt driveway or parking lot. The natural inclination would be to blame it on the sealer, but the stains actually come from natural compounds found in water, gravel and soil.
Mineral Salts can dry on the surface as a result of water run-off. They can also be pumped up through soil and gravel to the asphalt surface. White residue will often show up where there are cracks.

Calcium Carbonate is also common in soil and gravel and can leave a white residue.

Rusty red orange and brown are other common colors of residue left from rusty cars and plant byproducts.

Stains are more noticeable on freshly sealed asphalt, due to the contrast. Be patient, the stains can't be avoided and will wash away in time.


Investigative Geology Report 




Leave a comment

Comments will be approved before showing up.


Also in Blog

When To Use Speed Bumps in Your Parking Lot
When To Use Speed Bumps in Your Parking Lot

March 27, 2023

Although we can find them annoying, speed bumps do keep everyone safe. Learn more about when to use speed bumps in your parking lot to protect your visitors.

Continue Reading

Most Common Causes of Parking Lot Potholes
Most Common Causes of Parking Lot Potholes

March 20, 2023

When you own a parking lot, you want to ensure it always looks good. That’s why you should know the most common cause of parking lot potholes.

Continue Reading

Straight vs. Angled Parking: Which Is Right for You?
Straight vs. Angled Parking: Which Is Right for You?

March 03, 2023

If you are preparing to do construction on your parking lot, you might be wondering whether straight or angled parking is right for you. Read here to find out.

Continue Reading