XT Laminating Resin

Product reference: 3/95

Product title: XT Laminating Resin

Valid from: 5th December 2005

Last reviewed: May 2019

Type: A three-pack cold cured vinyl ester – urethane copolymer to be used in conjunction with glass or similar fiber reinforcement.

Suggested use

As a laminating resin for fiber reinforcement in environments where good chemical and temperature resistance is required.


This product is very moisture sensitive and may foam if mixed or applied in moisture condensing conditions, or at relative humidities above 75%. Tins are nitrogen filled, do not open before use. It is recommended that where possiblede-humidification equipment is used during the application of this product.

Health & safety

Before handling or using this product the material safety data sheet should be read, and all precautions observed. Particular attention is drawn to Hardener B which contains Isocyanate.

Application equipment

Fluid bath, spray, roller or brush.


Ensure fibers of reinforcement are fully soaked, preferably prior to application. Ensure any air pockets are removed by using a spiked or ridged roller. Area fully wetted should be uniform in colour with no white or light-coloured areas.

Mixing ratio

88.55 parts Base 01.58 parts Hardener A (organic peroxide)09.87 parts Hardener B (Isocyanate) (All ratios by weight)

Color availability

Unpigmented (translucent brown) only.

Volume solids

This material contains volatile liquid convertible to solids. Volume solids obtained will vary dependent uponpolymerization conditions. Nominally 99% of the contents are convertible to solid.

Flash point

88°F (31°C)

Temperature limits

302°F (150°C) Immersed. No known lower limit. 482°F (250°C) Non-immersed (provisional figures)


Product should be at ambient temperature before mixing. Mix the base with a good mechanical stirrer until it is uniformly mixed. Add Hardener A (organic peroxide) to the Base and mix thoroughly. Allow mix to stand for a minimum period of 10 minutes. Thoroughly stir the Base/peroxide mix again and leave to stand for a further minimum period of 10 minutes (NB. The Base/peroxide blend is relatively stable and will not react significantly until Hardener B is added). Add Hardener B (Isocyanate) and mix thoroughly before applying.

Pot life

25-30 Minutes at 68°F (20°C). Will vary dependent upon temperature. Refer to Corrocoat technical services for instructions regarding application in hot climatic conditions.


The performance of Corrothane XT Laminating Resin will be adversely affected by the addition of solvent thinners and their use isprohibited.


1 Gallon and 5 Gallon kits. Due to the hydroscopic nature of this product the use of part tins is not recommended, suitable kit sizes should be purchased to meet usage requirements.

Storage life

6 months stored and away from heat sources and direct sunlight and below 68°F (20°C). Frequent temperature cycling will shorten storage life and affect pot life. Beyond 4 months this product becomes increasingly susceptible to moisture uptake and gassing and therefore out of shelf-life material must not be used. (Some discoloration of the hardener B will occur with time, this has no detrimental effects on the material, all materials must be used within their designated shelf lives).


It is recommended that over coating takes place within a maximum of 12 hours at 68°F (20ºC). Although longer overcoating times may be acceptable this will depend upon climatic conditions and the level of ultraviolet light that cansignificantly accelerate speed of cure.

Curing time

Full cure circa 4 days at 68°F (20°C). For best results a short post cure of 4 to 12 hours at 176°F (80°C) is recommended. However, post cure is not necessary formany environments.

Spark testing

This product is subject to dielectric fatigue and repeated testing should be avoided, refer to data sheet 7/30

Theoretical spreading rate

32 sf per gallon at 40 mils dft

Cleaning fluid

Methyl Ethyl Ketone, Methyl Iso Butyl Ketone – before gelation.