A product of a mixture of a plurality of particles comprising a filler,characterised in that said mixture of a plurality of particles further comprises a first fibrous component and an adhesive, and a fluid that activates said adhesive toformanessentiallysolidarticlecomposedofsaidpluralityofparticles,saidadhesivebeingsubstantiallysoluble in said fluid, and said filler dissolving in said fluid at a substantially slower rate.