I had been wondering if I needed to secure the invite to the board and let that adhesive dry before MPing the entire thing. I need to go back thru all the links and instructions to see what steps everyone is showing.
LOML says a thin coat of MP on the plaque then add the invitation. Press it down/roll it out, etc to get the air bubbles out and fasten the edges so that they don't curl up. Let that dry well. Than continue with more MP.