Provided herein are apparatus and methods for radio frequency signal boosters. In an embodiment, a method of forming a planarized permanent layer includes providing a base substrate that has an uneven surface topography. The co-branded Internet site includes designations of both the retailer and the Internet service provider. A bonding agent is employed that may be filled with finely divided iron or other magnetic material. In particular, the invention applies to asynchronous motors capable of operating at high peripheral speeds typically starting at 100 m\xb7s\u22121, in particular motors intended for gas or oil applications, whether land-, sea-, or undersea-based.