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psg1ben-
Might be worth just applying a blob of each sealant on each surface. Leave overnight to cure. Then see if the blobs show any adhesion.
Other than that, the best advice is to use a 'non-tight' joint.
A perfect joint would squeeze nearly all the sealant out of the minimal gap between the two pieces.
Most sealants ask, hidden away on the technical data sheet, a minimum bead 6mm wide, to give those impressive tensile strength figures.
Is it possible to secure the two components about 3-4mm apart and then fill the gap with sealant?
mespilus
Depends upon what you are attempting to stick together.