A hot rubberish 'crack sealer' liquid hot solution the pro's use
is way better than any of the big box rip offs/caulking, crap
(no offense meant, to who recommends it)
it won't seal it "good or not for long" or get way down in the cracks
may have to go over it a couple times, add a lil' sand to hold it too
if you live in an area, where you get extremes cold & hot,
especially freezing cold/snow & ice sitting on it for days/weeks months
it's a good idea to seal it every 4-5 years max.,
ice/water expanding when freezing will reek havoc on the asphalt,
or water (freezing) getting under the slab
Yeah, they'll say "recommend" every 2 years,
but they are in the business to sell you sealer...
you can do it with a few tools & a few 5 gal. buckets
or however much you need depending on sqft
a sort of shallow v shaped squeegee like spreader (you can reuse if you clean it well)
& a soft bristle push broom, trow away, both work well
to spread it
The pros wear an old pair of shoes/boots, old pants shirt etc.
Pros they use like a spiked shoe clamp-ons (like an old roller-skate deal)
so they are above the wet level, doesn't smear the sealer after it's put down
have to wait a day or sometimes 2 to drive on it again
you can't hardly do it without getting it on you,
it's a mess put a (throwaway) tarp out under where you mix & stir,
fill the other buckets etc.
stuff looks brow before it dries too, it will be black
start at the higher levels & go down, go slow by the edges
try to do like your cutting-in with a paintbrush keep the bead in-front of you rolling
if you can't tell I've been there done that
I have no recommendations on brands, to buy
they never seem to have the same brand twice
I used to have to do it for patches at the dealerships too
good luck it's not that hard but messy, use goo quality sealer
& the liquid rubberized crack stuff