pretreatment by flame oxidation of ABS (Royalex) is "optional". The adhesion data provided by West shows little advantage for flame treatment of ABS however.
The first time I bonded skid plates to a Royalex boat with G Flex I used a propane torch to pretreat the hull. Since then I have applied more than a dozen without the flame pretreatment and the bond has been just fine.
It is possible to use more conventional epoxies (like West 105/206) to bond to Royalex, but at least in theory the cured G Flex has a lower modulus of elasticity (is more flexible) than the conventional epoxy, therefore resulting in a better compliance match with ABS.
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