Columbia Coronado 25 Owenrs Manual page 52

5.2 HULL TO DECK JOINTS
5.2.2 (continued)
Set deck on hull. First, set in engine, heat riser, and fuel tank.
Clamp the deck and the hull together in about six points on both sides.
Starting with the transom and working forward evenly on both sides,
drill and countersink screw holes through the deck flange and hull
flange, clamping the hull and deck together in a fair line as you go.
Use a flathead #8 self-tapping screw to pull the deck and hull flange
together. Space these 8-10 inches apart.
Clean the inside of the joint - using Acetone - leaving the surface
free from grease and other contaminates.
Mix a fairly thick batch of micro balloons to a consistency that is easily
workable with a putty knife and lay up into the recess of the joint about six
feet at a time. Make this a cool mixture so you will have from 30-45 minutes to
work with it. Next, take the mahogany strips that are provided (cut into 6'
lengths) and force up into the micro balloons until the bottom of the strips
are just above the bottom of the joint. In most areas you can cut some cleat
stock (1" x 1" pine) and, using the shelf space or cabinet tops of the hull
liner as an anchor base, force the mahogany strips in tight. Before the micro
balloons go off, scrape all the excess from the joint with a putty knife.
Continue this process completely around the hull. With micro balloons fill in
all areas so you have a flush joint from the deck to the hull. When the micro
balloons have cured apply a strip bond across the joint, extending 3" upward on
the deck and down the side of the hull. The bonds should consist of one layer
of 3 oz. mat and one layer of 7-1/2 oz. cloth. It is not necessary to make the
bonds a continuous strip. Cut the pieces 3 or 4 feet long and overlap the ends
2-3 inches. The mat comes in 5" widths and the cloth in 6" widths. This allows
the cloth to overlap the mat 1/2" and makes it a neat, professional looking
bond. Use body putty to fill any small imperfections. The joint is now
complete.
SECTION 5
Page 7