Method of sealingly edging a composite panel characterised in that it comprises: • a step (a) providing a composite panel of specified thickness having two planar faces, a side to be edged and at least one projecting corner, and of provision of a sealing strip of polymeric material with a width greater than the thickness of the composite panel, and having a first surface, called "inner surface" and a second surface, called "outer surface" in reference to the position of use, said inner surface having a layer of adhesive protected by a removable protective film; • a step (b) for the application of a strip stuck by an adhesive on the whole side and at a peripheral portion of the planar surfaces of the composite panel so that the adhesive is located between the composite panel and the inner surface of the strip, which sealingly protects the composite panel against dust, foreign matter or moisture uptake, said step (b) comprising to this end the following substeps: • a step of removal of the protective film of the strip to expose the adhesive, • a step of application to the inner surface of the strip carrying the adhesive layer on the side and on a peripheral portion of the planar surfaces of the composite panel; • a step (α) of deposition of a non-stick coating on the outer surface of the strip, wherein the step (α) is carried out before step (b), the strip being thus adapted to sealingly protect the composite panel against dust, foreign matter or moisture uptake; the method further comprising a step (β) for the localised removal of the non-stick coating at the projecting corners in order to create localised zones that are free of the non-stick coating, and a step (γ) of bonding the strip on itself at the corners free of the non-stick coating. • a step (a) providing a composite panel of specified thickness having two planar faces, a side to be edged and at least one projecting corner, and of provision of a sealing strip of polymeric material with a width greater than the thickness of the composite panel, and having a first surface, called "inner surface" and a second surface, called "outer surface" in reference to the position of use, said inner surface having a layer of adhesive protected by a removable protective film; • a step (b) for the application of a strip stuck by an adhesive on the whole side and at a peripheral portion of the planar surfaces of the composite panel so that the adhesive is located between the composite panel and the inner surface of the strip, which sealingly protects the composite panel against dust, foreign matter or moisture uptake, said step (b) comprising to this end the following substeps: • a step of removal of the protective film of the strip to expose the adhesive, • a step of application to the inner surface of the strip carrying the adhesive layer on the side and on a peripheral portion of the planar surfaces of the composite panel; • a step of removal of the protective film of the strip to expose the adhesive, • a step of application to the inner surface of the strip carrying the adhesive layer on the side and on a peripheral portion of the planar surfaces of the composite panel; • a step (α) of deposition of a non-stick coating on the outer surface of the strip, wherein the step (α) is carried out before step (b), the strip being thus adapted to sealingly protect the composite panel against dust, foreign matter or moisture uptake; the method further comprising a step (β) for the localised removal of the non-stick coating at the projecting corners in order to create localised zones that are free of the non-stick coating, and a step (γ) of bonding the strip on itself at the corners free of the non-stick coating. the strip being thus adapted to sealingly protect the composite panel against dust, foreign matter or moisture uptake; the method further comprising a step (β) for the localised removal of the non-stick coating at the projecting corners in order to create localised zones that are free of the non-stick coating, and a step (γ) of bonding the strip on itself at the corners free of the non-stick coating.