What are my options for asphalt driveway repair and/or sealing?
I'm repairing my asphalt driveway currently.  I have lots of cracks that grow weeds through.  I tried to get it sealed with liquid sealant, but within a couple of months it was clear that this didn't work, because many new weeds have grown through the sealant.

I think the workers who did the sealing did a really poor job, and I regret hiring them.  Since then, I've read several DIY articles about it and I've started fixing the cracks myself.  Here's what I'm doing:


Clean driveway.  I used a stiff broom, and even my shop-vac right over the cracks.
Clear out the cracks.  Remove weeds, dirt, debris.  Scrape the crack out with a prybar.  Clean again with a garden hose on "jet" setting.  Let dry.
Fill the cracks with asphalt filler.  This comes in tubes like caulk, and I use a caulking gun to apply it.  I use a cheap putty knife to smooth the top of the caulk.  It's messy stuff, and I need to clean my tools with a powerful solvent.  I use Gunk, an engine de-greaser.
Once I have all the cracks repaired with caulk, I plan to re-seal the driveway again with liquid sealant.  I agree with @Scott Vercuski, wear clothes you plan to throw out.  I saw the workers using a pushbroom to spread the liquid, so I recommend getting a pushbroom you plan to use only for this project.


I also have a couple of spots where a crack has let water seep in and erode a cavity beneath the asphalt.  I'm going to have to chip out a section of asphalt with a hammer and chisel and restore it with with asphalt patch.  This might be what you have to do with your low spot.