A Primer is a Primer or Sealer. But an Undercoat is usually an Undercoat but not an Primer or Sealer. However, there is an Acrylic Primer/Undercoat that is for Primer or Sealer or Undercoat. But the Oil (non-acrylic) based give best results in my opinion.
That water-based acrylic does seem to raise the grain. But what I do like about it, it dries quickly and you can put on a few coats, then wipe with a fine abrasive, it seems soft enough to flat off easily.
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