I've just done exactly the same this last weekend.
I didn't want to drill the front mudguard/fender either as this is introdicing a point of weakenss and will be the initiation points for cracks to propegate from over time with vibration.
I used a solvent free two part epoxy adhesive, that is water proof and sets in 5 minutes.
Sanding the two mating surfaces with something like 320 grit and then cleaning with meths provides a good, grease free contact area for the surfaces to bond with the adhesive.
It's ablsolutley solid and looks a very neat job.
I didn't want to drill the front mudguard/fender either as this is introdicing a point of weakenss and will be the initiation points for cracks to propegate from over time with vibration.
I used a solvent free two part epoxy adhesive, that is water proof and sets in 5 minutes.
Sanding the two mating surfaces with something like 320 grit and then cleaning with meths provides a good, grease free contact area for the surfaces to bond with the adhesive.
It's ablsolutley solid and looks a very neat job.