Gypsum only helps if the clay is tight due to excessive sodium in the soil. Otherwise gypsum will not help a clay soil. Water the area in small amounts to allow it to soak in a little. Then when it is moderately moist (not wet) rent the aerator and aerate as deeply as is practical. Then apply 1/3 inch of compost or peat moss over the surface of the lawn and water it in well. This should help your lawn a lot.
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