If your asphalt has been down for six months, and you "still" have not put a sealer on it. Then, you've already made your biggest mistake.
(And You've Probably Already Done It)
But first, let me say this. If some paving "expert", said that you didn't need to sealcoat. Please, keep in mind. It is not in his best interest for you to sealcoat and more than double the life of your asphalt.
And according to "real" experts, that's exactly what sealcoating can do. More than "double" the life of your asphalt.
It is a down hill journey from day one, for your asphalt.
And then, here comes the sun.
It does "not" cure, and age, and go thru some process that makes it better for a year or two. New asphalt takes water like a sponge, on day one. So let's see what a real expert says about that.
According to the Asphalt Institute, in Lexington Ky., "the number one contributor to pavement stress, is the accumulation of moisture in the pavement structure itself".
In other words, water seepage is the "worst" enemy.
The BIGGEST Mistake
You'll Ever Make !!!!!!
Again, on day one, the sun begins to dry out and literally vaporize the asphalt binder that holds it together.
New asphalt, remains pliable to some degree for month's after it is put down. That's why you don't generally see cracks for about a year. And paving contractors will guarantee it for about a year.
However, with the sun working on the outside, and water working on the inside, the asphalt slowly looses it's flexibility. And becomes more prone to cracking and deterioration.
So Let's Do The Math
If water starts working on the inside on day one. And the sun starts working on the outside on day one. Why wait for month's or years to start "protecting" it???? It's not rocket science.
The Most Important Thing....................
And I'm talking months, not years. As soon as surface oils have evaporated enough for the sealer to bond, "THAT" is when you should sealcoat.
By sealcoating in the first year (the first 3-6 months, for best results) you are protecting your "entire" investment, instead of just what's left after years of deterioration.
That you will ever do for your asphalt, is get that first sealcoat down early.