I am guessing you are not looking to get a full decon and ceramic coating done. My Y and WRX are both Cquartz coated and I used to use CarPro Reload as a booster which I would recommend. My new last step spray is 2 oz CarPro Reload, 2 oz, CarPro Echo2, 28 oz of water.
In addition there is Adam's Ceramic Boost or Gtechniq C2 V3 Liquid Crystal. All 3 of these will give paint and trim months of protection.
Should do the trick for you.