Methylacrylate esters cure in the absence of oxygen. If any gaps exposed to air, it won't cure. Submerge in still water for an hour to cure, or coat exposed edges with baking soda for instant hardening of any glue that the baking soda can directly touch (won't help if air pockets or veins exist which funnel air under the gas check). For other applications, smearing Vaseline or grease to remove air works, or purge part in a baggie with canned "air" (CO2) and let sit for an hour.