Disclaimer: The item I received may possibly have had a broken seal, and been dehydrated, so your experience may vary.
I did mix this product before starting.
I found it to be too thick to spread fast enough before it began to dry. This caused clumping and lift of paint off my project.
I then attempted to spread with a flat silicone brush, which helped somewhat.
But then, upon pouring out more, I found clumps and stringiness in the bottle. Futher attempts to mix did not improve it.
I will be returning this product.