I use a commercial (i.e. purchased) dew heater strap for my C8. I can't remember what brand, but I know it isn't a Kendrick... doesn't matter much which brand... My feeling is a strap is probably better than resistors for a large aperture like the scope, but for smaller apertures like your finderscope, EPs and camera lenses a DIY project with resistors is quite feasible in the long term. My main concern is handling over a long period of time and maintaining reliability.
If you want to build your own, have a look here:
http://www.iceinspace.com.au/index.p...63,292,0,0,1,0
and
http://www.iceinspace.com.au/index.p...63,285,0,0,1,0
Al.