make a template for the desired shape and width of the tunnel, draw it out on a heavy type brown paper of very thin luan. just remember you can draw half of the shape then flip it as to insure everything is the same on both side of the center line of the boat. make sure you make a mark on the forward and aft of the template dead center. to find centerline of the boat measure from chine to chine make the marks and line up the template of your tunnel. then using 4 in high speed grinder and a cuttting wheel cut it out, dont worry about stringers and such at this point. main thing is to see what you have to work with when the glass is cut. ie where you will need to cut the floor to have access to your inside laminations and new stringer work. there are alot of steps involved after that but nothing very hard to do!
Liquid Nails
Loose fill (usually fiberglass or cellulose) or batt insulation (usually fiberglass) are both good insulations for attics. Batts are better for do it yourselfers, but loose fill is cheaper to install when using a contractor.
Fiberglass.
Fiberglass. Over time concrete stains and can become rough, where fiberglass retains its smooth texture. Fiberglass will also give you more options.
If it's laid properly, it can be. Then again...you get a guy who uses the best resins, and the best fiberglass, and he can give you a stronger composite using fiberglass than an inexperienced person using carbon fiber.
A sponge and some fiberglass sealers works the best on a fiberglass boat. There are other fiberglass cleaning material available depending on what your particular need is. For just basic cleaning, I would go with the sponge and fiberglass sealer.
www.columns.net may be your best choice.
www.tank-depot.com offers the best prices online for buying a Fiberglass Tank for pressure washing.
fire glass .co
I'd say that fiberglass is the best. FEMA even recommends using fiberglass storm shelters because they provide the best protection even from tornadoes. Aside from the superior protection, they are also comfortable and durable.
the best ones are made of carbon-fiber the good ones are made of fiberglass the regular stock ones are a mix of hard plastic and fiberglass
Fiberglass tanks are a later development to the traditional concrete tanks, and many people now see them as a superior product. They are much lighter so transporting them to your location is simpler and being lighter weight means it will take less effort to install. Despite being lighter, fiber glass is actually stronger than concrete and because there are no pores in fiberglass it means that they are not prone to attack by sewer gases that can cause the concrete tanks to deteriorate. This means a fiberglass tank should last longer than a concrete tank.