HEAVY BODY acrylics mean that the paints have a thick, buttery consistency which means great coverage and opacity.
Stay away from Student quality acrylics because they usually contain more fillers and less pigment which means paint coverage and consistency is not strong.
ACRYLIC GLAZING: Liquid or acrylic retarders are MAGIC tools for creating acrylic glazes by extending the dry time and work ability of acrylic paintings, allowing them to stay wet for longer periods of time.
Squeeze out a tiny amount of medium on your palette about the size of a dime. Dab color into your brush, move around on your palette to work paint into brush (very little is needed) and add your glazing medium.
You want your paint to be thin in order for it to be a glaze. If the consistency is that of water colors, thin and watery you are on the right track.
Always make sure that a glaze is TOTALLY dry before you work on the area again.
REMEMBER: Altho' acrylics are very forgiving it's easier to add paint then subtract it.
I LOVE Brenda Harris' mediums. She has a White, Clear and Slow Blend that are mixable with ANY brand of acrylic paints.
In choosing paints to glaze with...use paints that are labeled or are known to be TRANSPARENT.
Glazing is used mostly when painting photo-realism pieces.
Stay tuned for more on this "type" of painting using acrylics.