Also Sprach Dan Krueger :

They make an indoor/outdoor carpet adhesive that you can trowel on.

Nonono, don't do that! The Indoor/outdoor adhesive is not waterproof by a
long shot, and turns the consistiency of chewed bubblegum after it gets
wet.

I've used Henry's #263 Outdoor carpet adhesive with good results. It's
solvent based, instead of the indoor/outdoor stuff which is water
based. You spread it on the floor with a notched trowel. It gives you
a half hour or so of working time before it sets, but only if you use it
in the shade, and preferably on a cool day. in the bright sun, it starts
to set up after 5 minutes or so, I found that out the hard way.

You can buy in in Home Depot or Lowes in the carpet area.

http://www.henryadhesives.com/prod-263.htm

Contact adhesive is good stuff but tricky to work with. Zero room for error!

Aggreed, but most people have trouble because they use it
incorrectly. They think it has to be tacky when you assemble the
surfaces, and that gets you into trouble because you rarely positin the
objects correctly the first time. You want both sides to be cured, so
that if you let them touch they don't stick. After you carefully have the
pieces in position, you then apply even, firm pressure to create the
bond. A roller works well. Once they're bonded, there's no way to
reposition them, unlike the carpet adhesive where you have a few minutes
to stretch the wrinkles out before it cures.

Dan

--
For NASA, space is still a high priority.

-- Dan Quayle