I cant think of any reson why polyethelene wouldnt seal well with an o-ring. Imo it is the perfect material for waterblock tops apart from the fact that its not clear, but niether is anodised aluminuim tops which seem v common. Polyethelene would proabably look very nice if painted. Would anyone know if a special kind of plaint would be needed? I think any normal paint for plastics should work?
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