I use Future for:
Glossing up the surface for decaling and as a barrier for solvent type wasshes
Stubburn decals can be applied over wet Future then coated over with it to seal the decal in place
Brushing multiple coats of Future from the center of the decal out gets rid of thick film edge know as a 'Step'
Canopies dipped in Future look clearer and hides small scratches
Can be used to attach clear and small pe parts
Can be mixed with certain flat acrylic paints to get desired sheen
A drop on instrument faces will look like glass
Can be used as a pigment fixer for modeling wet mud