I've used Weldbond Contact Cement. The one with the little brush in the cap.

Do yourself a favor a buy a cheapie set of tiny model airplane paint brushes to apply the contact cement.

And once you open the contact cement, it's only a matter of time before it eventually hardens and turns to rubber over the course of six or eight months.

I like the Weldbond brand. It's very effective. Apply it to both surfaces. Allow it to dry for a few minutes. Press together.

I've also lately been using Loctite Clear Silicone sealant for certain items.

In your case, I'd probably start with the Weldbond Contact Cement -- available in Home Depot, Lowes and similar stores.