Applying two coats of any sealer will dry and create a better finish much better than one thick coat. These sealers are water based, and they cure and form a film primarily during the evaporation of water from the coating. A thin coat will evaporate much faster and create a single uniform layer.
Much like paint, sealer applied in 2 thin coats dries and cures much better than with 1 thick coat.
APPLYING TOO MUCH SEALER OR THE WRONG KIND OF SEALER
While slathering seal coat over asphalt in a thick layer can be tempting, a “more is better” approach is detrimental to the pavement beneath. Too much sealer can lead to premature cracking, which will shorten the lifespan of your driveway.
Coverage rate:
Total of 2 coats – average coverage around 50 square feet per gallon (or 5 square yards).
But if you want to drive on it, then you have to wait a minimum of 12 hours for it to dry and cure. If it's overcast or if rain is in the forecast, then the drying and curing process will definitely take much longer. For optimum results, we recommend that you use your driveway 48 to 72 hours after sealcoat was applied.
Rain can wash away all of the hard work that you put into your driveway. The sealer will be washed away by the rain if you don't wait long enough for it to dry.
Sealcoating is not designed to be an asphalt crack filler, it is made for sealing the surface and protecting it from the elements such as UV light, salts and oils. It is not flexible enough to fill a crack without re-cracking and it does not have adhesion quality's that Asphalt Crack Filler has.
You should allow at least 24-48 hours for an asphalt sealcoat to dry. However, drying time varies based on the conditions of that particular day. Factors that impact the time it takes to completely dry include: Temperature.
Wet or dry? A hot, dry driveway above 95° F will dry to fast; the result can be a very uneven finish. We recommend cleaning the surface first using a driveway cleaner, which also serves to cool off the surface. Make sure there is no puddled water on the driveway before sealing.
Squeegee applications typically produce a better bond between the pavement's surface and the sealant.
To apply the sealer, you will need a brush and a long-handled paint roller or squeegee. To save time and maximize coverage, we recommend using a long-handle paint roller that is 18” wide with a ⅜” nap roller.
The Drawbacks of Seal Coating
One is that it can be messy and difficult to apply evenly. It's also important to note that sealants will not repair significant damage to your driveway; they will only protect it from further damage. If your driveway is damaged, you'll need to have it repaired before sealcoating it.
In some cases, a residential driveway will only need one coat of sealant. However, if the asphalt sealcoating has never been sealed before, it may take a second coat to give it the rich, deep finish that most homeowners prefer.
Not sealing your driveway leads to bitumen loss which leads to water penetrating down to the base causing it to fail which in turn causes potholes and cracks. Once the cracking and pothole cycle begins it's very difficult or impossible to stop.
While we still recommend those with cracks developing try to get their asphalt seal coated before it gets too cold, spring is really the best time for seal coating. It means your driveways and parking lots look great for the entire year, and warm spring weather is the perfect temperature for a well-set coat.
Rain does not bother the seal-coating. However, the pavement surface needs to be dry when applying the seal-coating.
For it to be successful though, you need to apply the first coat of sealant within 12-18 months after asphalt installation, and then again every 2-3 years. Any more frequent than this and your driveway may begin chipping or flaking, but any longer than this and your driveway could deteriorate.
The product of choice is oil-based sealer because it achieves more complete penetration and adhesion to old, rough asphalt surfaces and typically lasts several times as long, usually four to six years, depending on weather conditions.
If the sealer is drying shiny and glossy, that's a very bad sign. Good quality asphalt sealer should dry a flat, black matte. Shiny is slippery and will not endure. To learn more about quality asphalt sealer click here.
Although latex acrylic sealers are one of the most expensive options, they're one of the best asphalt driveway sealer options because they're durable, stain resistant, and non-toxic. They can last 5 to 10 years and are UV-resistant to stand up against hotter climates.
Surface Cracks
They are almost always caused by sealer being applied too thick. Surface cracks will always still be visible after sealcoating.
Seal coating allows for a smoother, crack-free driveway, and because smoother pavements extend pavement life by as much as 10% to 25%, you won't have to worry about replacement or repairs for a much longer period of time.
Filling Cracks
As we noted above, filling in cracks costs between $1 and $3 per linear foot. However, a professional will charge a minimum service fee to diagnose and repair asphalt driveways. And so, you'll pay an average of $100 to $400 for crack repair on your whole driveway, depending on the severity.