anyway to re-thaw paint that went hard like rock? i got a lot of paint bottle that becomes top part thinner lower part paint color...

tried.. it will dissolve only top part. guess i have to use thaw slowly

once i tried using hot water to heat up the bottle. worked a bit... not enough though

Question:
will mr. hobby paint bottle exposed to indirect/direct sunlight have any effects? like paint get dried up faster or something? or flaky things appearing?