In reality, you are not suppose to be shooting Lacquer over enamels, you can do the opposite though. Tamiya paints are not as "hot" as regular lacquers, they really are just modified enamels and can even be shot right over bare plastic. Make it a habit to test everything you try on a scrap piece of plastic, preferably from the model you are building before deciding on your painting options and mostly if you are clear coating decals as these can be more delicate to some paints than others. Also, make it a habit to always use primer before painting, it will give you a better canvas for paints to adhere to and further protect the plastic from hotter paints.