For use in flat roofing applications where regulations specify a fire-retardant system. Conforms to BS476 Part 3:2004, FAB classification.
Cromar PRO GRP Topcoat is a dark grey, pre-pigmented, isophthalic acid based, filled fire-retardant roofing top-coat that conforms to BS476 Part 3:2004, FAB classification. Recommended for use in flat roofing applications where regulations specify a fire-retardant system.
Designed for roller application which exhibits good levelling characteristics and sag resistance on inclined surfaces. The cured top-coat is tack-free and water- tight with excellent water and weather resistance providing a maintenance-free surface.
What is PRO GRP?
GRP stands for Glass Reinforced Polyester and is also known as Glass-Fibre.
This system is cold applied on site, giving it a seamless and flexible weatherproof finish that resists water, heat and frost.
The resulting surface gives a strong architectural finish that looks very impressive. If maintained properly it will last as long as the building stands.
Cromar have developed this technology further to produce the perfect all weather protection for any flat roof. PRO GRP can be applied in small domestic situations right through to large industrial environments.
Benefits of a GRP System
For full application instructions download the PRO GRP Installation Guide.
Cromar PRO GRP Topcoat is designed for use at ambient temperatures between 18℃ and 25℃, and requires the addition of 2% medium activity MEKP catalyst to achieve an efficient cure.
For optimum performance the top-coat should be applied to a dry, dust-free surface and built up to film thickness of 500 - 600 microns to achieve the desired fire retardant characteristics in the finished structure.
Before use, the temperature of the top-coat should be 18 – 25℃. For application at lower ambient temperatures a high activity MEKP catalyst can be used at an addition level of 2%.
The values above are recommended coverage rates for estimating purposes we would recommend coverage rates or 1.5kg/m 2 for resin, and 0.5 kg/m 2 for top coat.
| Liquid properties | Thixotropic |
| Gel time @ 25℃ | <15 minutes |
| 2% medium activity MEKP | |
Please refer to the Safety Data Sheet on Cromar PRO GRP – Topcoat, downloadable from the "data sheets" tab towards the top of the page.
Always read and understand the Safety Data Sheet before working with this product.
Directly mixing any organic peroxide with a metal soap, amine or other polymerization accelerator or promoter will result in violent decomposition.
Customer agrees that before placing an Order, Customer has read and understood the most up to date Product Data Sheet for the Product. Where we have access to the Product Data Sheet from the manufacturer, we will either provide a copy on request, or include a link to the Product Data Sheet available on the manufacturer’s website. Customer further agrees that we have no liability for any errors or omissions contained within the Product Data Sheets. For more information, please see our Terms & Conditions of Sale.
 Ghulam Hussain on 2024-03-30 18:12:43 | Question: Hi, I have a GRP structure that needs to be waterproofed and repainted in green. Can you please advise as to what products will work best. Thanks |
Answer from Rawlins’ Technical Team: Thank you for the enquiry, please can you provide more information and pictures of the area in question to [email protected] so we can assist with a specification. | |
| mark martin on 2022-01-26 10:12:36 | Question: Hi I have a grp roof which is going to be walked on what material should i sprinkle or mix in with the topcoat. Regards Mark |
Answer from Rawlins’ Technical Team: Assuming the topcoat being used is Cromar Pro GRP Topcoat we can recommend Cromar Scangrit Grade 6 Antislip for mixing with the topcoat to provide an antislip surface. | |
Cromar PRO GRP Topcoat is only available with the shipping and delivery timescales listed below - please do not contact our Customer Support Team with enquiries about alternative or earlier shipping and delivery times.
Saturdays and Sundays, as well as Bank Holidays, are not classed as working days.
Orders placed after the cut-off for this product will not be processed for earliest dispatch until 9am the next working day.
All delivery costs below are excluding VAT
Cromar Pro GRP Trims, Corners & Outlets, for use with Cromar`s Advanced Glassfibre Roofing System.Range of trims includes drip, raised edge, simulated lead flashing, angle fillet and roll mop External and internal raised angle trims Corner trims also available, in 7 configurations 3 configurations of rainwater outlets to choose from...
£7.69 (incl. VAT)
£6.41 (ex. VAT)
Cromar PRO GRP Resin is a cold applied polyester resin designed specifically for Roofing Applications. Easy to form around complex situations, Pro GRP Resin is durable and able to resist foot traffic, an essential component in roofing systems.Very low styrene emission Low viscosity allowing rapid and efficient fibre wet-out Long pot life...
£76.63 (incl. VAT)
£63.86 (ex. VAT)
Cromar PRO GRP Acetone, solvent used for cleaning tools and areas contaminated with adhesives, polyesters, resins and other similar products. Also known as Propan-2-one, 2-propanone, di-methyl ketone.Part of the Cromar Pro GRP Roofing SystemMore Information Delivery Info
£33.66 (incl. VAT)
£28.05 (ex. VAT)
Cromar PRO GRP Hardener is a general purpose MEKP and gives consistent room temperature curing of unsaturated polyester resins and gelcoat/topcoats.Suitable applications include hand lay-up, spray-up, RTM, continuous laminating, centrifugal casting, filament winding, polymer concrete and vacuum infusion Methyl Ethyl Ketone peroxide in...
£18.64 (incl. VAT)
£15.53 (ex. VAT)
Cromar Application Tools are a range of application tools and accessories for use when applying products from the Cromar range. Range includes:Resin Rollers and Refills Bubble Buster Rollers GRP Paint Brushes Mixing and Graduating Buckets Applicator gunsMore Information Delivery Info
£2.10 (incl. VAT)
£1.75 (ex. VAT)
A handy kit containing everything required to install GRP for a 13 sqm roof. Roofing kit contains: 1 x 20kg Pro GRP Resin 1 x 10kg Pro GRP Top Coat 1 x 450 Fibre Glass Matting 6.75kg (approx.)Includes GRP Accessory Kit (see further below for full contents) GRP roofing trims required (sold separately) Cold applied - no heat...
£394.01 (incl. VAT)
£328.34 (ex. VAT)
