A panel for use over a vehicle airbag includes a skin layer with a tear seam formed therein. The skin layer is made from a material that includes a polymer matrix and one or more transmissivity-reducers in the form of microflake fillers or fillers having a monomodal particle size distribution. The transmissivity-reducers are included in an amount that reduces the transmissivity of light through the material to reduce variation in laser scoring processes and also in an amount that does not substantially alter the mechanical properties of the polymer matrix. Skin layers made from these materials can be used in laser scoring processes of TPO coverings that are thinner than previously known.