Gel Coats / Top Coats

A gelcoat is a material, based on a modified thermosetting resin, used to provide a high-quality finish on the visible surface of a fibre-reinforced composite that is used on mould during any of the common composite processes: hand lay-up, infusion, RTM light, RTM classic, spray-up, etc.

A topcoat is a gelcoat that has been modified with paraffin in order the get rid off the tacky finish typical from the polyester or vinyl ester gel coats and is used as a final coat, normally at the back of a composite part. Epoxy topcoats have no paraffin and are just considered as paints.

The most common gelcoats are based on unsaturated polyester, vinyl ester or epoxy resin chemistry. At Castro Composites we offer a really wide range of gelcoats of all types and colors. Gelcoats are modified resins which are applied to moulds in the liquid state. They are cured to form crosslinked polymers and are subsequently backed with composite polymer matrices, often mixtures of resin and fibres.

The manufactured component, when sufficiently cured and removed from the mould, presents the gelcoated surface. This is usually a coloured, glossy surface which improves the aesthetic appearance of the part, such as a bath tube, a boat hull or deck, a wind blade, a car body panel, etc.

Many marine craft and aircraft are manufactured using composite materials with an outer layer of gelcoat, typically 0.5 mm to 0.8 mm (0.02 in to 0.03 in) thick. Gelcoats are designed to be durable, providing resistance to ultraviolet degradation and hydrolysis.

Specialized gelcoats can be used for tooling manufacture which in turn are used to manufacture parts. These require very high levels of durability to overcome the mechanical and thermal stresses encountered during the curing and demoulding processes.

In addition to any pigment a gelcoat will, if necessary, contain a thixotropic additive to assist its tenacity to vertical portions of the mould whilst it cures.

Topcoats

Polyester GC

Vinyl Ester GC

Epoxy GC

Showing 1-24 of 615 item(s)

Colorless Polyester gel coat Crystic PA 65

Crystic Gelcoat 65PA Isophthalic Brush Clear Gelcoat

WGC0006B

Scott Bader

Crystic Gelcoat 65PA is a pre-accelerated, isophthalic gelcoat. It has been formulated for brush application, but spray versions are available. Crystic Gelcoat 65PA is available in a wide range of colours and the information contained in this technical data sheet also applies to these pigmented versions. A non-accelerated version, Crystic Gelcoat 65, can...

€12.00 €14.52 Tax incl. €12.00 Tax excl.

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White Crystic GT-600 Isophthalic Gelcoat - BRUSH

Crystic GT-600 WHITE Isophthalic Gelcoat - BRUSH

GT-600WBase

Crystic® Gelcoat GT-600 is a high performance isophthalic gelcoat. It is pre-accelerated and formulated for brush application. It has been developed to have excellent intrinsic water and weather resistance.

€13.66 €16.53 Tax incl. €13.66 Tax excl.

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Crystic GT-900 Clear Isophthalic Polyester Gelcoat - SPRAY

Crystic® Gelcoat GT-900 is a high performance isophthalic gelcoat. It is filled, pre-accelerated and formulated for spray application.Crystic® Gelcoat GT-900 has been developed to have excellent intrinsic water and weather resistance.

€13.78 €16.67 Tax incl. €13.78 Tax excl.

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White Crystic GT-900 Isophthalic Gelcoat - SPRAY

GT900whitebase

€13.78 €16.67 Tax incl. €13.78 Tax excl.

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Crystic 65PA clear brush Polyester Top coat

Crystic Topcoat 65PAX Clear Brush Isophthalic Polyester Topcoat

WTC0001

Scott Bader

Crystic Topcoat 65PAX is a pre-accelerated, isophthalic topcoat. It has been formulated for brush application and is available in a restricted range of colours. Crystic Topcoat 65PAX is designed for use where a smooth finish is required on the reverse side of a laminate. Deflection Temperature Under Load (1.80 MPa): 75 ºC.

€14.75 €17.85 Tax incl. €14.75 Tax excl.

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Crystic 65PA White 337 Brush Polyester Gelcoat

WGC0337B

Scott Bader

Crystic Gelcoat 65PA is a pre-accelerated, isophthalic gelcoat. It has been formulated for brush application, but spray versions are available.

€15.00 €18.15 Tax incl. €15.00 Tax excl.

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UP571 Polyester Gelcoat for Tooling Repair and Manufacturing

UP571 is a blend of specially formulated high temperature polyester resins, light beige color pigments and additives designed to produce high gloss mold surfaces.

€15.00 €18.15 Tax incl. €15.00 Tax excl.

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RAL 7034 Crystic GT-600 PAX Isophtalic Topcoat - BRUSH

The topcoat Crystic® Ral 7034 GT-600 is a topcoat isoftálico high-performance, preacelerado and formulated for application with brush or roller.