Do you have mixing instructions for your truck bed liner available online?
Our general instructions are available at https://spray-lining.net/polyurea-application-instructions/ and include many of our products. Your specific product might have additional instructions, but the basic instructions apply to all of our current DIY products with the exception of the cartridge products.
Each product formulation and specific application may also include specific additional information. Variations in product formula sometimes requires a slight variation.