XF
Rev: 4, 2010-02-01
Page 12
4.1.6.
Cleaning before fastening
Rub down the surface of the tunnel, both on the outside and inside, to
remove all wax. Finally wipe with acetone.
Typical pre cut tunnel ready for installation.
(Observe the rubbed ends.)
Rub down the surface of the hull, both on the outside and inside, to
remove all wax. Finally, wipe with acetone.
Remove all topcoat from a surface area of at least 100 mm around the
holes on the inside of the hull (e.g. using a circular sanding disc) to get
adhesion for the polyester. Vacuum clean and wipe down with acetone.
NB:
If the boat has a “sandwich hull” the core around the tunnel must be
ground away sufficiently to allow the application of the glass fibre mat.
4.1.7.
Prevent filling from running out
Should it be impossible to fit the tunnel with
glass fibre all the way around, the entire space
beneath the tunnel must be filled. (Fig left.) The
filling must be uniform and might be made from
talcum powder and polyester, or equivalent.
To prevent the filling from running aft, awaxed
plate, formed to fit the bilge and tunnel shapes,
must be put in place whilst filling and curing.