I know I will probably get flamed on this, but I have combined D151 and DG501 on a pad (MF and foam depedning on paint) 2 dime sizes each and gotten really nice results on daily drivers with decent protection. After spreading the product on 2 bump it up to 4 or 5 then back down to 2 or 3 let dry to a haze and then remove. The cut of D151 and the cleaning of DG501 produce nice results, D151 is not know for long lasting protection but DG 501 is , so combined it last for 5-6 months, For what it is worth I checked with Megs and DG and neither stated combining would be an issue. I just did a 13 Camry that had minor swirls and tree sap stains, obviously washed and clayed first, came out really nice. Owner was very happy and the neighbors were impressed. Ok fire suit on.