Just seeking advice. If you were adding a vanilla custard in between the layers of a vanilla cake, would you then also add buttercream?? When I add a raspberry filling, for instance, I DO add the buttercream on top of the raspberry, then layer and repeat.  What about custard?? don't want to overpower the cake but don't want it to be lacking buttercream either!  Help!!

I don't, no. I don't add anything in addition to my filling of choice.  Custard/curd/jam OR buttercream.  

AWith fillings that can seep into the cake--like custard, jam, or preserves--I butter the layers with buttercream. It's not enough to taste, just a barrier.

I make a cord with buttercream all around the edge of the cake and inside the custard (or jam, or whatever u like!)

Thank you all for the tips!!   I did decide to do as maybenot suggested and lightly spread a thin layer of buttercream before adding the custard. I sampled the cake scraps and thought it was delicious!!!

Thanks again!! I can always rely on CC subscribers to help me out of a jam!! lol no pun intended!