What is the best wood window preservative or protection agent?

Is there any product available for Complete Wood Preservative Penetration etc. in Sapwood and Heartwood products?

Right here .. you can read all about it ..

http://www.biltbestwindowparts.com/content/kop-coat-wood-preservative

 

Complete Wood Preservative Penetration
of Sapwood and Heartwood

Tru-Core penetration shown in red

Powerful Penetration

The photo above shows a cross section of a 2" x 4". The red coloration is a tracer of the Tru-Core Preservative penetration. The Tru-Core chemistry includes various combinations of proven environmentally responsible fungicides and insecticides.