Extreme variances in warmth and dampness are especially harmful to sketches. In a colder climate, any paint will turn out to be progressively weak. While raised moistness can prompt unsafe shape just as development and withdrawal of the canvas support because of dampness assimilation and sublimation. My painting of Guru Nanak Dev Ji once cracked because the temperature was not stable. As paint ages, it will turn out to be progressively weak also. Again colder temperatures quicken this, just as does atmosphere variances. Beside atmosphere control, common materials whereupon the composition is executed can be secured by presenting it to formalin vapors which capture the normal characteristics of cotton and cloth canvases, consequently serving to limit development and compression of the filaments. You can check out a painting Shivoham on this website that is a well-maintained oil painting and one called Panch Tatva, this painting is on a circular canvas.