Why does the lid concave after being sealed with paint thinner ? Will it eventually bust if I don’t release the pressure sucking the lid inward ?

just a chemical reaction to air-- I once thought it was a change in elevation when I moved. Its not a problem, Just open it carefully and when you put it away make sure the rim is clean. I have had mine for years and it doesn't break.its kind of comforting to see is sealed so the fumes are not gassing you.

Specific Uses For Product	Fine artist brushes
Special Feature	Leak Resistant
Colour	Silicone Brush Cleaning
Brand	Silicoil
Finish Type	Polished
Product Dimensions	12.7D x 12.7W x 12.7H Centimeters
Shape	Cylinder with square top
Capacity	0.75 Pounds
Number of Items	1
UPC	607029000174
Global Trade Identification Number	00607029000174
Manufacturer	Winsor & Newton
Country of Origin	USA
Item model number	8289008
ASIN	B0027ACEI2

Winsor & Newton Silicoil, Brush Cleaning Tank

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