I installed crown moulding in my Lvrm/Dnrm/Kit and foyer between late Aug and Thanksgiving useing 4-in wide Medium Density Fiberboard (MDF). The property is 12-years old and is located in the Wash, DC climatic zone. I filled mitre joints and scarf cuts with DAP brand Plastic Wood (Cellulose Fibre Filler) for interior and exterior application or DAP brand premium caulking. Today, I noticed most of the scarf cut joints and two of the mitred cut joints have opened/separated as if the moldings had been pulled in opposite directions from the joint. We had a clean and tight fit after filling, drying, sanding, priming and three coats of latex enamel. However, each affected joint is now approximately 1/16" wide. The temperature range in the house has been between 65 degrees and 80 degrees.
Someone suggested we use only Glazing Compound to fill joints. Area contractors remarked they only use caulking. We paid little attention to the comments of local builders as quality in the DC area is notorously poor.
We would appreciate your opinion on what we did wrong and what we can do at this time to improve the appearance of the scarf and mitre joints.
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