Quickie Q2 Lite Construction Manual - page 51

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 In the plans, when "knife trim" is called for, this assumes the 

three to four hour wait, even though not specifically stated. Don't fall 

apart if you miss the knife trim stage and have to trim the fully cured 

glass. If you wait until the layup is completely set, then saw along the 

edge with a coping saw, Dremel, band saw, saber saw, etc. Smooth the edge 

with a sanding block. When trimming a cured edge, be careful of the 

"needles" (sharp protrusions of glass-frayed edges supported with epoxy). 

.....

The needles can be avoided by returning three hours after the layup 

to make the knife trim. Knife trim time varies with temperature: about 

six hours at 60 degrees and one hour at 90 degrees. 

OTHER SURFACES

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 Surface preparation (step 3 of the basic glass layup) varies with 

the material that you are laying up over. The layup over foam was covered 

in detail in step 3. To prepare a cured glass surface for layup, the 

cured surface must be sanded to a completely dull finish with 36 to 60-

grit sandpaper. If any of the glossy surface remains, an incomplete bond 

results which is weak. Better yet, use peel ply as described later, Micro 

slurry should not be applied to glass surfaces being bonded; this weakens 

the joint. Wood requires no special preparation for bonding but should be 

free of grease, oil, paints, and varnish. Sand wood surfaces with 36-grit 

sandpaper before layup. Metal bonding is not relied upon for strength but 

PAGE 3-9

Q2 Plans - Chapter 3 - Page 3-10