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if you use thinned Hammerite it may react with the paint as it is cellulose based.Bob
Thin superglue should be fine,The P38 is porous so will provide a good key for it.Is the superstructure wood or plasticard?Bob
Mark47, P38 is a polyester resin based product, so use polyester resin to bond it together! Just mix some with the appropriate amount of hardner and run it into the crack, it should be as strong as the original job... if not stronger.