ABYC FIBERGLASS BOAT REPAIR
CERTIFICATION EXAM QUESTION AND
CORRECT ANSWERS (VERIFIED
ANSWERS) PLUS RATIONALES 2026 Q&A
INSTANT DOWNLOAD PDF
1. Which resin is most commonly used in fiberglass boat repair?
A. Epoxy resin
B. Vinyl ester resin
C. Polyester resin
D. Phenolic resin
Answer: C. Polyester resin
Rationale: Polyester resin is widely used in fiberglass boat construction and
repair due to its cost-effectiveness and compatibility with existing laminates.
2. What is the primary purpose of fiberglass reinforcement?
A. Add color to the laminate
B. Increase strength and stiffness
C. Improve UV resistance
D. Reduce resin curing time
Answer: B. Increase strength and stiffness
Rationale: Fiberglass reinforcement provides structural strength and rigidity to
composite repairs.
3. Which fiberglass fabric provides the highest strength-to-weight ratio?
A. Chopped strand mat
B. Woven roving
C. Biaxial cloth
D. Surface veil
,Answer: C. Biaxial cloth
Rationale: Biaxial cloth aligns fibers in two directions, providing superior
strength and load distribution.
4. What is the main function of gelcoat?
A. Structural reinforcement
B. Waterproof barrier
C. Cosmetic finish and protection
D. Adhesive bonding
Answer: C. Cosmetic finish and protection
Rationale: Gelcoat provides a smooth, durable, and UV-resistant outer finish for
fiberglass structures.
5. Why must damaged fiberglass be ground to a taper before repair?
A. To save resin
B. To increase bonding surface area
C. To reduce repair time
D. To prevent overheating
Answer: B. To increase bonding surface area
Rationale: A tapered grind ensures proper bonding and strength between old
and new laminate.
6. Which tool is most appropriate for grinding fiberglass repairs?
A. Belt sander
B. Angle grinder with abrasive disc
C. Hand plane
D. Wire brush
Answer: B. Angle grinder with abrasive disc
Rationale: An angle grinder efficiently removes damaged laminate and creates
proper tapers.
7. What personal protective equipment is essential when working with
fiberglass?
A. Cotton gloves only
B. Safety glasses and respirator
, C. Earplugs only
D. Rubber boots
Answer: B. Safety glasses and respirator
Rationale: Fiberglass dust and resin fumes are hazardous and require eye and
respiratory protection.
8. What is the purpose of using wax in polyester resin?
A. Increase strength
B. Improve color
C. Allow surface curing
D. Reduce viscosity
Answer: C. Allow surface curing
Rationale: Wax rises to the surface during curing, preventing air inhibition and
allowing full cure.
9. What defect is caused by trapped air in a laminate?
A. Delamination
B. Blistering
C. Dry spots
D. Voids
Answer: D. Voids
Rationale: Trapped air creates voids that weaken the laminate structure.
10.Which resin offers the best adhesion to cured fiberglass?
A. Polyester
B. Vinyl ester
C. Epoxy
D. Phenolic
Answer: C. Epoxy
Rationale: Epoxy resin bonds exceptionally well to cured fiberglass substrates.
11.What is osmosis in fiberglass boats?
A. Resin curing failure
B. Water migration causing blisters
CERTIFICATION EXAM QUESTION AND
CORRECT ANSWERS (VERIFIED
ANSWERS) PLUS RATIONALES 2026 Q&A
INSTANT DOWNLOAD PDF
1. Which resin is most commonly used in fiberglass boat repair?
A. Epoxy resin
B. Vinyl ester resin
C. Polyester resin
D. Phenolic resin
Answer: C. Polyester resin
Rationale: Polyester resin is widely used in fiberglass boat construction and
repair due to its cost-effectiveness and compatibility with existing laminates.
2. What is the primary purpose of fiberglass reinforcement?
A. Add color to the laminate
B. Increase strength and stiffness
C. Improve UV resistance
D. Reduce resin curing time
Answer: B. Increase strength and stiffness
Rationale: Fiberglass reinforcement provides structural strength and rigidity to
composite repairs.
3. Which fiberglass fabric provides the highest strength-to-weight ratio?
A. Chopped strand mat
B. Woven roving
C. Biaxial cloth
D. Surface veil
,Answer: C. Biaxial cloth
Rationale: Biaxial cloth aligns fibers in two directions, providing superior
strength and load distribution.
4. What is the main function of gelcoat?
A. Structural reinforcement
B. Waterproof barrier
C. Cosmetic finish and protection
D. Adhesive bonding
Answer: C. Cosmetic finish and protection
Rationale: Gelcoat provides a smooth, durable, and UV-resistant outer finish for
fiberglass structures.
5. Why must damaged fiberglass be ground to a taper before repair?
A. To save resin
B. To increase bonding surface area
C. To reduce repair time
D. To prevent overheating
Answer: B. To increase bonding surface area
Rationale: A tapered grind ensures proper bonding and strength between old
and new laminate.
6. Which tool is most appropriate for grinding fiberglass repairs?
A. Belt sander
B. Angle grinder with abrasive disc
C. Hand plane
D. Wire brush
Answer: B. Angle grinder with abrasive disc
Rationale: An angle grinder efficiently removes damaged laminate and creates
proper tapers.
7. What personal protective equipment is essential when working with
fiberglass?
A. Cotton gloves only
B. Safety glasses and respirator
, C. Earplugs only
D. Rubber boots
Answer: B. Safety glasses and respirator
Rationale: Fiberglass dust and resin fumes are hazardous and require eye and
respiratory protection.
8. What is the purpose of using wax in polyester resin?
A. Increase strength
B. Improve color
C. Allow surface curing
D. Reduce viscosity
Answer: C. Allow surface curing
Rationale: Wax rises to the surface during curing, preventing air inhibition and
allowing full cure.
9. What defect is caused by trapped air in a laminate?
A. Delamination
B. Blistering
C. Dry spots
D. Voids
Answer: D. Voids
Rationale: Trapped air creates voids that weaken the laminate structure.
10.Which resin offers the best adhesion to cured fiberglass?
A. Polyester
B. Vinyl ester
C. Epoxy
D. Phenolic
Answer: C. Epoxy
Rationale: Epoxy resin bonds exceptionally well to cured fiberglass substrates.
11.What is osmosis in fiberglass boats?
A. Resin curing failure
B. Water migration causing blisters
