A bit of polyurethane adhesive should do the trick. It's held panels onto the engine bays of my kit cars, so it should be fine for an ickle badge. It looks like silicone sealant, but it's stickier. And any excess cleans off easily with white spirit.
@Brommers started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
A bit of polyurethane adhesive should do the trick. It's held panels onto the engine bays of my kit cars, so it should be fine for an ickle badge. It looks like silicone sealant, but it's stickier. And any excess cleans off easily with white spirit.