I've been experimenting with waterborne finishes. Although I've had varying results with spray quality, I've found that sealing with shellac (Zinnser SealCoat) before top coating with the waterborne finishes gives greater depth. I've now learned that the waterborne finish that sprays the best recommends not using shellac for sealer. I thought dewaxed shellac was the anything under it anything over it sealer. Are there adhesion problems with waterborne finishes and shellac?