Mercury Marine Heavy Duty 899846001 - Manual (Page 48)

REPAIRS
44
Apply three thin layers of adhesive with a short bristle brush, in a
circular pattern on both the backside of the patch and the patch
area on the boat. Allow each layer to dry for 5‑10 minutes before
applying the next layer. After applying the third layer, wait 5‑10
minutes and then apply the patch to the prepared area and press
down firmly. Using a smooth object (a back of a tablespoon works
well), force out any air bubbles that may have been trapped under
the patch, working from the center of the patch to the outside.
After removing the masking tape, place a 4‑5 pound weight onto
the patch and allow 24 hours drying time before pressurizing the
repaired air chamber.