Two answers. 1)) Yes it will work.... BUT It wont work as a practical matter. when you form plastic you stretch it, it gets thinner. By the time you get anywhere close to the bottom of your slot, the material will have thinned so far it will probably fail and leak. 2))
It will not work, the depth to thickness ratio had been exceeded. A piece of material 1/8th thick is recommended to be used in slots wider than 1/4 inch.