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you have two choices depending on the type of plastic.
A plastic WELDER liquid, which like a hardcore modelling glue, literally melts the plastic, rebonding it and making an almost good as new seal.
Or like 9 said, a super glue, cyano type of glue that fills in pores and creates a bond by forming new, hard material.
If you get future cracks in plastic, drill a small circle hole (tiny drill bit) at the end of the crack to stop it spreading any further. We do this mostly for plastic covers, dashboards and panelling on our planes. Makes them last longer but looks like a shotgun went off.
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