A chemical sealant device is provided for repairing a flat tire of a wheel, which consists of a rim for supporting and fitting a tire thereabout. A first mechanism is on the interior of the rim for carrying a portion of the load of the wheel after the tire is punctured and becomes partially flat. A second mechanism is within the first carrying mechanism for releasing at predetermined intervals of rotation of the wheel, tire chemical sealant and compressed air into the tire so that eventually the tire will be repaired and tire pressure will be at least partially restored, whereby road damage to the tire will be prevented.