OK here is a direct quote from the Multiplex instruction manual:
Page 8
Adhesive: Use any type of medium or thick cyano-acrylate adhesive (“cyano” - not in the MULTIPLEX range). Do not use styrofoam cyano.
Page 9
This model is not made of styrofoam(tm), and it is not possible to glue the material using white glue or epoxy. Please be sure to use cyano-acrylate glue exclusively, preferably in conjunction with cyano activator (kicker).
The question is NOT what glue to use... the question is will the CA work with the fiberglass to give me a fiberglass and resin type result as it relates to strength not finish? If you want to fight the which glue is better war... the war is elsewhere.
ORIGINAL: KC36330
simply stating that just because the manual said you can ONLY use CA, that's not the only glue what will work, the polyurethane glue works very well as does the above suggested Elmers.