Your lacquer primer is OK. You do not want to apply the bondo over the primer, Sand or grind down to metal or other bondo before applying bondo as it has to have something to stick to besides primer. Sand out a larger area than what you will be working.
Generally, you should avoid lacquor products altogether. They shrink with age and are subject to top coat burn through and lifting. Use the new system of epoxy products. Bondo goes on metal only. If you need to feather between transitions of paint thickness, get a polyester spotting coat such as Evercoat or similar catalyzed product. They will not shrink.
there is a product made by Evercoat called plyester glazputty basically a bondo type product that can be used over primer or even paint but use the Evercoat product others make a similar product but I've found only theirs works over primer and paint.. this is the dark blue can part number 400 I think
Evercoat does make a two part putty that can be applied over primer. Make sre you scuff the primer with 180 first. But If you are going to need alot of bondo you don`t wnt to use this.It`s not thick like regular bondo. If you try to apply to much it will run.If you need alot do what Henry said and remove the primar first. The Part #s For the Evercoat is 416 &417.