Sicaflex is perfectly fine for holding the motors in And also Tiger seal......If both products are used in marine applications then believe you me they are fine for holding motors in a Carp Boat....lord knows what they have used to hold the motors in...Why not contact Angling technics and ask them....BEST of luck with that one !!!!!!!!!!!
Make sure that you do roughen up the surface of the pumps so the sealent as somewhere to grab on to.
NEVER had one come back with the products I use.......bonded one in on my own boat 8years ago and it is still in use today and all I used was Sticks like XXXXXXXXX..........
I Use Tiger seal to hold body kits on cars etc.
Dave