Be sure to apply body sealer to the body panel joints and door edges (tip of outer panel folded part), etc., to waterproof and rustproof them.
HINT:
Apply degreasing agent to a clean cloth and clean the sealer application areas.
After removing the applied spot sealer from the sealer application areas using thinner or equivalent, rust-proof the areas by applying primer or equivalent. Then apply body sealer.
If sealer is unnecessarily applied to an area, apply degreasing agent to a clean cloth and clean off the sealer immediately.