When the surface is previously finished, painted with a non-porous paint or sealed. Milk paint will resist and chip if it cannot be absorbed, as it is in porous surfaces and raw wood. The ratios of bonding agent can be adjusted depending on the amount of seal or shine on the piece being painted. Do not use the bonding agent or use it in select areas if a “chippy” look is desired. Remember that painting a pre-finished without sanding and/or using the bonding agent is unpredictable!