I have been playing about with different types of liquid plastic glue recently and what I have found out came as a bit of a surprise. the EMA or similar liquid plastic weld ( which is great and I have been using for years ) provides a quick weld, followed by a quick evaporation. The MEK, Humbrol Liquid Poly etc type ( which I have not used for years cos it is too slow drying ), provides a deeper weld into the plastic. which is great for added strength. When I think it through, it is obviously a function of its slower evaporation time over the Plastic Weld.
So, in answer to your question, if it was me, I would use the MEK type for the four hull sections and deck joins, and the quicker Plastic Weld for all the upper works and smaller parts. remembering to back up all the joins in the hull, including portholes, with either epoxy, silicone or Devcon Plastic Welder, to provide a good mechanical back up to the welded join.
Now, I must get back to repairing a customers Flower Class Corvette
