loading spinner
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 paraffi...

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.

More

Gel Coats / Top Coats  There are 437 products.

Subcategories

  • Polyester GC

    A gel coat is the first layer of resin applied to the prepared mould, it forms the finish of one of the surface laminations, providing protection against chemicals, weathering, moisture or any aggression from the environment.

    Chemically, gels coats are thermosetting resins with pigments and additives in suspension which allow its application to the mould surface, even in vertical walls without sagging.

    Generally they have greater abrasion resistance and corrosion resistance, as well to the UV radiation and to temperature changes than their base resins.

    They shall be applied with a consumption of 600 g/m2 for parts and a maximum of 1 kg/m2 for moulds.

    What properties does a gel coat provide to fiberglass plastic reinforcements?

    Quality and color stability.

    Weatherability.

    Water resistance (no bubbles)

    Heat resistance.

    Abrasion resistance.

    Absence of surface porosity.

    High brightness, permanent in time.

    Resistance to chemicals. 

    Types of polyester gelcoats

    Orthophthalic polyester: industrial parts with good mechanical and light stability properties. It is used for general purposes that do not require high especific properties (weatherability, hydrolysis, water, food or chemical resistance).

    Isophthalic polyester: better performance in open air, in marine environment, to high temperatures and to solvents. Mainly used for nautical and health applications.

  • Vinyl Ester GC

    A gel coat is the first layer of resin applied to the prepared mould, it forms the finish of one of the surface laminations, providing protection against chemicals, weathering, moisture or any aggression from the environment.

    Chemically, gels coats are thermosetting resins with pigments and additives in suspension which allow its application to the mould surface, even in vertical walls without sagging.

    Generally they have greater abrasion resistance and corrosion resistance, as well to the UV radiation and to temperature changes than their base resins.

    They shall be applied with a consumption of 600 g/m2 for parts and a maximum of 1 kg/m2 for moulds.

    What properties does a gel coat provide to fiberglass plastic reinforcements?

    Quality and color stability.

    Weatherability.

    Water resistance (no bubbles)

    Heat resistance.

    Abrasion resistance.

    Absence of surface porosity.

    High brightness, permanent in time.

    Resistance to chemicals. 

    Vinyl ester gelcoats

    They have better properties than polyester, thus they are also used in moulds, products of higher category and especially when high chemical resistance is required.

  • Epoxy GC
  • Top Coats

    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.

per page
Showing 1 - 100 of 437 items
Showing 1 - 100 of 437 items
Average rating for our customers
4.9 ( On 5 )
More feedbacks...

Gel Coats / Top Coats

Specials

Create quotation from my cart Request a quote

Category : Gel Coats / Top Coats

4.9 / 5

Based on 573 feedback(s)