Yes it will start to damage the seal. You can flip it if you want, but i think it happens even without doing so due to solvent vapors. Although it takes a little while for it to have any noticeable affect.
This is the reason i won't use mason jars with limo anymore. It happens with naptha too, but limo especially will damage the seal and begin to leak out. I have a feeling that its not to healthy to have this happening, especially when you wash and reuse solvent over and over. Contaminants from the seal dissolving will build up over time. Not to even mention the paint on the bottom of some mason lids.
Sep funnels and GG stoppered glassware is a good investment. Mason jars work if you only plan on doing a few extractions, but all glass is really the only way to go in the long run imho.
"let those who have talked to the elves, find each other and band together" -TMK
In a society in which nearly everybody is dominated by somebody else's mind or by a disembodied mind, it becomes increasingly difficult to learn the truth about the activities of governments and corporations, about the quality or value of products, or about the health of one's own place and economy.
In such a society, also, our private economies will depend less upon the private ownership of real, usable property, and more upon property that is institutional and abstract, beyond individual control, such as money, insurance policies, certificates of deposit, stocks, etc. And as our private economies become more abstract, the mutual, free helps and pleasures of family and community life will be supplanted by a kind of displaced citizenship and by commerce with impersonal and self-interested suppliers...
The great enemy of freedom is the alignment of political power with wealth. This alignment destroys the commonwealth - that is, the natural wealth of localities and the local economies of household, neighborhood, and community - and so destroys democracy, of which the commonwealth is the foundation and practical means.” - Wendell Berry