MST MST Hull & Fiberglass Repair

Question 1

What is the correct ratio of hardener to resin when mixing standard polyester laminating resin for a fiberglass repair?

Accepted Answer

1–2% MEKP by weight

Answer

10% MEKP by weight

Answer

50/50 by volume

Answer

5 drops per gallon only

Question 2

Before applying a fiberglass patch, the damaged area should be ground to what profile?

Accepted Answer

A feathered 12:1 taper

Answer

A 90-degree straight cut

Answer

A V-shaped groove only

Answer

No preparation is needed

Question 3

Which type of fiberglass cloth is preferred for above-waterline cosmetic repairs due to its smooth surface finish?

Accepted Answer

Plain weave cloth

Answer

Chopped strand mat

Answer

Woven roving

Answer

Biaxial fabric

Question 4

Osmotic blistering on a fiberglass hull is caused primarily by what process?

Accepted Answer

Water migrating through the gel coat into the laminate

Answer

Electrolysis attacking the hull exterior

Answer

UV degradation of outer gel coat

Answer

Improper antifouling paint application

Question 5

When repairing an osmotic blister, what is the first step after opening the blister?

Accepted Answer

Allow the hull to dry thoroughly for weeks

Answer

Immediately apply epoxy barrier coat

Answer

Sand and prime the area

Answer

Refill with polyester putty

Question 6

What material is commonly used as a structural core in modern fiberglass boat construction?

Accepted Answer

End-grain balsa

Answer

Solid aluminum

Answer

Carbon steel plate

Answer

Solid mahogany