Al's Liner flattener additive allows users to achieve a semi-gloss or matte finish when applying their spray on bed liner. This additive is was designed for military use where anti-reflective coatings were a necessity and it has been used for over a decade under the most extreme conditions. The Al's Liner vinyl flattener is perfect for exterior applications where gloss finishes are too reflective. When mixing your Al's Liner bed liner compounds, half a bottle of additive to one gallon of Al's Liner will give a semi-gloss finish while mixing in a full bottle of additive will give a flat matte finish.