
Sealcoating a Commercial Lot
Sealcoating a commercial parking lot is a different job from sealing a residential driveway, in scale, in equipment and in the coating itself, which SCAQMD regulates as a separate category with its own limit. We do commercial lots only. A crew and a product sized for a driveway will not produce a uniform finish across an acre of traffic-worn asphalt.
Crack Sealing and the Right Sealant Class
Hot-applied crack sealants are classified by the climate they are formulated for under ASTM D6690, and the moderate-climate class is the correct one here. Cold-climate grades stay soft in summer heat and track under tires, and at least one manufacturer states plainly that its cold-weather product is not recommended for parking lots. We specify to the climate rather than to whatever is on the truck.
Patching, Overlay, or Neither
A lot with isolated failures needs patching, a lot with widespread surface distress over sound base needs an overlay, and a lot with base failure needs neither until the base is addressed. We report which of the three you actually have. Selling an overlay onto a failing base is the most expensive mistake available in this trade.
Why Paint Fades Faster Here
National guidance on re-stripe intervals is largely written against markets where wear comes from freeze-thaw cycling, road salt and plow blades, none of which exist here. In this basin the drivers are ultraviolet exposure and traffic volume, and paint chalks and washes out rather than being scraped away. We set intervals against local conditions, which run shorter than the figures most national sources quote.
Surface Preparation and the Oil Spots
Paint applied over dust, loose material or oil will not bond, and oil spots in particular reject coating and reappear through it within weeks. We clean, blow and treat contaminated areas before any paint is laid. Preparation is the part of the job a low bid removes first, and it is the part that decides how long the result lasts.
Removing Old Markings Instead of Burying Them
When a layout changes, the old lines have to come off. Painting black over them hides the problem for a season and then reappears as ghost lines under low sun and after rain, leaving drivers reading two layouts at once. We remove rather than cover, and we tell owners when a proposal that looks cheaper is doing the opposite.
Grinding, Water Blasting and the Methods Nobody Mentions
Marking removal is done by grinding, by high-pressure water blasting, by shot blasting, or chemically, and each leaves a different scar on the surface. Grinding is fast and leaves the most visible mark; water blasting is cleaner and slower. We choose by surface type and by how visible the scar will be under the new layout, and we explain the trade-off rather than presenting one method as the only one.
When Sealcoating Is the Wrong Purchase
Sealcoat protects sound asphalt from oxidation and water. It does not bridge structural cracking, it does not fix a failing base, and applied over either it buys appearance for a season while the underlying failure continues. We say so when that is the situation, even though the honest answer is the smaller invoice.