Looking good.
Whats the fibreglass filler like to fill and sand?
Filled my backbox with Builders Bog - Crap 
-Applied it on Monday & attempted to rub it back tonight & its still soft so I scraped it all off.
Used Gyprock top coat on the front of cab and found it good, dries quick & easy to sand.
Hmm,
Generally builders bog should setup within a couple of hours for sanding. Maybe not the correct mixture of hardner went into it?
yep i agree, problem is usually the mixture ratio is 50 to 1 ( read the can to be sure) and unless you have a set of scales that measures in 0.001 steps its pretty hard to get it right so i always end up putting in more hardener than needed and they only give you 10 grams of hardner per 500 grams of bog so i always run out of hardener, and you cant buy the hardener separately. (well i cant find it anywhere)
