: How much filling is really necessary after sanding?

: I've sanded to what I think is smooth and fair but there are still a couple
: of 6" gaps about the thickness of a business card but I'm frightened
: to fill & sand because I think I've sanded those areas more than
: enough & I don't want to risk sanding through!!!!

: What are the implications of glassing and epoxying over such gaps?

Chas,

Here are two links to a couple real pros that address this subject:
Vaclav Stejskal at One Ocean Kayaks - http://oneoceankayaks.com/Wshophtm/Shop9.htm
John Michne - http://www.michneboat.com/ (navigate to Builders Corner-filling the cracks)

Take a thorough look at both of these websites. You will find lots of information.

Ted