Do I need to use a bonding agent between scratch and base coat plaster on the ceiling? Leave a comment

I’m doing a traditional 3-coat plaster over wooden lath to repair a 4×4 hole.

I’m using StructoLite base coat plaster.

I applied Plaster Weld to the lath prior to putting up the scratch coat, but I wondered if it is necessary or helpful to use the bonding agent between base coat and scratch coat, especially as it on the ceiling. I thought it might improve the bond, but I haven’t seen a many references to doing this, and the product was invented after the heyday of 3-coat plaster systems.

Is it necessary to wet the scratch coat prior to putting up the base coat otherwise?

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