In my experience, pink lentils don't work in salads as well as other types, as they quickly become mushy when boiled. (golubkakitchen.com)
It is, however, best if eaten within four hours of making it as the watermelon leaks more and more water and becomes mushy after a while. (veronicascornucopia.com)
Always follow the directions carefully since some foods, especially fish and shrimp, can become mushy if left in too long. (fieryfoodscentral.com)