After 3 weeks of epoxying and sanding I decided that before starting of setting the keelbox I add one more layer of glass cloth to both sided of keel foil. Just for sure. I have some glass clothes (used for coating outside the hull), so I did it.

Teflon glide box is milled also so the another teflon block to reinforce the keel foil head on the top back side of it.

See: http://blog.visualsystem.hu/index.php/2013/06/16/finishing-keel-foil-12/