Follow up this first step by wrapping four half-lapped layers of rubber insulating tape over the cambric tape, which creates a moisture barrier and provides the primary insulation in the connection. Finally, over-wrap the assembly with a minimum of two half-lapped layers of vinyl electrical tape. This should extend approximately two tape widths beyond the ends of the rubber tape. Stretch this tape as you wrap it so you get good conformance to the underlying structure. This also helps complete the moisture seal.

3. Wrap the tape Start wrapping the tape around the surface you want to seal. Make sure to overlap the tape by at least half of its width to ensure a secure seal. Press the tape firmly as you wrap it around to activate the fusing process.
how to use amalgamating tape

Conclusion
You’ll find control boxes in nearly every industry around the world, from the boxes that control heavy industrial equipment to DIY project boxes. Each type of control box has its own requirements and idiosyncrasies, and each demands careful attention to best practices of design.