Which of the following can be a result of too much thinner in the color?

Using too much thinner in the color can lead to various issues in the final paint finish, but the problem of blistering is particularly significant in this context. When excess thinner is added to the paint, the solvent can evaporate too quickly during the application process. This rapid evaporation doesn't allow the paint to adhere properly to the surface or to itself, leading to trapped air or solvents underneath. As a result, blisters can form on the surface as the paint dries, which compromises the overall integrity and appearance of the finish.

The other potential issues, such as texture problems, dulling of the finish, and uneven gloss, may arise from different factors related to paint application and formulation but do not primarily result from the excessive use of thinner in the same direct manner as blistering. For instance, texture problems could stem from incorrect application techniques or using incompatible products, while dulling and uneven gloss often relate to application conditions or the quality of the materials used rather than solely an issue of thinner concentration. In summary, blistering is a specific consequence of adding too much thinner, directly impacting the paint's performance and finish.