A coextruded PMMA-based multi-layer foil comprising at least a PMMA-based layer A and a PMMA-based layer B for application on a substrate having a surface in such a way, that the layer A is directed towards environment and the layer B is directed towards the surface of the substrate, wherein the layer A comprises, based on the total weight of the layer A: from 0.0 to 99.9 wt.-% of a polymethyl(meth)acrylate; from 0.0 to 95.0 wt.-% of one or several impact modifiers selected from particulate impact modifiers and thermoplastic impact modifiers; from 0.0 to 30.0 wt.-% of a fluoropolymer; from 0.1 to 5.0 wt.-% of a first UV-absorber, wherein the first UV-absorber is a triazine type UV-absorber; from 0.0 to 5.0 wt.-% of one or several UV-stabilizers; wherein the cumulative content of the polymethyl(meth)acrylate and of one or several impact modifiers in the layer A is at least 50 wt.-%, preferably at least 60 wt.-%, more preferably at least 70 wt.-%, yet even more preferably at least 80 wt.-%, still more preferably at least 90 wt.-%, particularly preferably at least 95 wt.-% and not more than 99.9 wt.-%, based on the weight of the layer A; the layer A comprises one or more UV stabilisers selected from hindered amine light stabilizers (HALS) and antioxidants; and wherein the spectral transmittance of the layer A at any wavelength λ A is not more than 10%; wherein 270 nm ≤ λ A ≤ 360 nm; and the layer B comprises, based on the total weight of the layer B: from 0.0 to 99.9 wt.-% of a polymethyl(meth)acrylate; from 0.0 to 85.0 wt.-% of one or several impact modifiers selected from particulate impact modifiers and thermoplastic impact modifiers; from 0.1 to 5.0 wt.-% of a second UV-absorber, which is distinct from the first UV-absorber, wherein the second UV-absorber is a benzotriazole type UV-absorber; from 0.0 to 5.0 wt.-% of one or several UV-stabilizers; and from 0.0 to 20.0 wt.-% of an adhesion-promoting copolymer comprising (i) from 70.0 to 95.0 wt.-% methyl methacrylate; (ii) from 0.5 to 15.0 wt.-% maleic anhydride; and (iii) from 0.0 to 25.0 wt.-% of other vinyl-copolymerizable monomers having no functional groups other than the vinyl function, based on the weight of the adhesion-promoting copolymer; and wherein the cumulative content of the polymethyl(meth)acrylate and of one or several impact modifiers in the layer B is at least 50 wt.-%, preferably at least 60 wt.-%, more preferably at least 70 wt.-%, yet even more preferably at least 80 wt.-%, still more preferably at least 90 wt.-%, particularly preferably at least 95 wt.-% and not more than 99.9 wt.-%, based on the weight of the layer B, the layer B comprises one or more UV stabilisers selected from hindered amine light stabilizers (HALS) and antioxidants; and wherein the spectral transmittance of the layer B at any wavelength λ B is not more than 10%; wherein 270 nm ≤ λ B ≤ 370 nm; and the layer A comprises not more than 0.1 wt.-%, preferably not more than 0.05 wt.-% of the second UV absorber and the layer B comprises not more than 0.1 wt.-%, preferably not more than 0.05 wt.-% of the first UV absorber. from 0.0 to 99.9 wt.-% of a polymethyl(meth)acrylate; from 0.0 to 95.0 wt.-% of one or several impact modifiers selected from particulate impact modifiers and thermoplastic impact modifiers; from 0.0 to 30.0 wt.-% of a fluoropolymer; from 0.1 to 5.0 wt.-% of a first UV-absorber, wherein the first UV-absorber is a triazine type UV-absorber; from 0.0 to 5.0 wt.-% of one or several UV-stabilizers; from 0.0 to 99.9 wt.-% of a polymethyl(meth)acrylate; from 0.0 to 85.0 wt.-% of one or several impact modifiers selected from particulate impact modifiers and thermoplastic impact modifiers; from 0.1 to 5.0 wt.-% of a second UV-absorber, which is distinct from the first UV-absorber, wherein the second UV-absorber is a benzotriazole type UV-absorber; from 0.0 to 5.0 wt.-% of one or several UV-stabilizers; and from 0.0 to 20.0 wt.-% of an adhesion-promoting copolymer comprising (i) from 70.0 to 95.0 wt.-% methyl methacrylate; (ii) from 0.5 to 15.0 wt.-% maleic anhydride; and (iii) from 0.0 to 25.0 wt.-% of other vinyl-copolymerizable monomers having no functional groups other than the vinyl function, based on the weight of the adhesion-promoting copolymer; and (i) from 70.0 to 95.0 wt.-% methyl methacrylate; (ii) from 0.5 to 15.0 wt.-% maleic anhydride; and (iii) from 0.0 to 25.0 wt.-% of other vinyl-copolymerizable monomers having no functional groups other than the vinyl function, based on the weight of the adhesion-promoting copolymer; and