Generally, there are four types of IP rating for LED tape lights. They are IP33, IP55, IP65 and IP68.
IP33 is the non waterproof version:
IP55 is a waterproof version. It uses silicone injection on the surface. There is 3M self-adhesive in the back of PCB.
IP65 is another waterproof version. IP65 LED tape is encapsulated with silicone sleeve / tube. Regularly there is no 3M self-adhesive in the back. These IP65 LED tape lights are generally installed with clips applied in the anti-static bag.
Of course there is strong self-adhesive tape for choose to attach in the back for special applications. (Not included in the package if not indicated)
IP68 is the high level of waterproof degree. Totally injected with silicone gel, outer is with silicone sleeve / tube.
IP68 LED tape lights can be submerged under water without any problems.
You can also choose self-adhesive tape to attach in the back for special applications. (Not included in the package if not indicated.)