HMG Synthetic BDX Primer


HMG Synthetic BDX Primer is a high build, anti-corrosive, single pack alkyd primer for use under all HMG synthetic topcoats, combining high build and excellent sandability with outstanding application and scratch filling properties.

  • For use on suitably prepared structural steel, chassis, fabrication and aluminium
  • Can be applied to bare or previously painted substrates including mild & shot blasted steel, aluminium and galvanised steel
  • Touch-dry in 4 hours at 20°C
  • Brush or spray application
  • Professional use only
  • Coverage: 16.6m²/L at 55 microns DFT

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  • Current colour: Light Grey - 702
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  • Off White
  • Dark Grey
  • Red Oxide - 65
  • Light Grey - 702
£15.11(ex. VAT)
£18.13 (inc. VAT)
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Available for Delivery (See Delivery Options Below)


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Features & Benefits

  • Coverage: 16.6m² per ltr at 55 microns DFT
  • Touch dry: 4 hours mins at 20⁰C
  • Volume Solids: 55%
  • Maximum VOC (RFU): 480g/L
  • Dry Film: 55 microns
  • Wet Film: 100 microns
  • Suitable for use under HMG C71 Speedline
  • Recommended thinner: HMG Thinner 2611 or HMG Thinner 2612
  • Suggested Primer: ST3000 2K Etch Primer
  • Manufactured under the auspices of an ISO 9001 management system


Drying Times

Drying Times At 20°C
Touch Dry: 4 hours
Hard Dry: 24 hours

  • Allow hard dry prior to sanding
  • HMG technical data sheets (see section above) indicate a dry film thickness that will be achieved when applying a particular wet film thickness
  • These values are a guide only and are not to be used as specifications
  • Film thickness will vary depending on actual use and specification
  • Great care should be taken to achieve the dft stated in the agreed specification and to avoid areas of excessively low or high thickness


Surface Preparation

  • Ensure surfaces are clean, dry and free from grease, oils, dust and other contamination prior to application
  • Read and follow the safety data sheet, product data sheet (see section above) and label instructions
  • Thoroughly clean and degrease using suitable HMG Prep Clean 2802, 2803 or 2804
  • Rust/corrosion to be removed to Sa or St standards, remove to clean metallic appearance with little or no
    rust/corrosion present
  • Areas where blast cleaning is not cost effective or practical, then the use of HMG Ferrozinc Rust Converter is an alternative
  • Though HMG Ferrozinc is not an equivalent alternative to shot blasting, it does offer a far superior performance than conventional coatings applied to slightly rusted surfaces
  • HMG Ferrozinc is used after simple wire brushing to remove surface rust, prior to application of primer
  • Stir all paints thoroughly before use
  • Always use the same batch number on the same job
  • Check colour & sheen
  • Filter the product immediately before use
  • Reduce emissions and maintain quality by replacing tin lid after use.




  • BDX Primer is suitable as a primer coat for suitably prepared metals, clean and free of grease, oils and other contaminants
  • Not suitable for coating over bitumen or chlorinated rubber coatings
  • Suitability with existing coatings to be checked with test application prior to use

Application Climate

  • Substrate temperature should be 5⁰C or above for application and during cure, and a minimum of 3⁰C above the dew point
  • Adequate dry air ventilation should be supplied during drying

Application Information

  • Thinning should only take place after material is thoroughly mixed
  • Application and use should always conform with the codes of practice described in BS 6150 and BS 5493

Bare substrates

  • Mild steel – Remove millscale and thoroughly degrease using suitable HMG Prep Clean. Abrade with P80 – P180 if necessary, prior to application of primer
  • Shot Blasted Steel – Remove all traces of blast grit/sand prior to application of primer
  • Aluminium – Abrade with P180 – P320, degrease with suitable HMG Prep Clean prior to application of primer
  • Galvanised Steel – Degrease with suitable HMG Prep Clean, apply HMG Mordant Wash, apply HMG Etch Primer and if required HMG Primer

Previously Painted

  • High pressure wash to remove all loose debris and poorly adhered previous coatings to remove all salts and other contaminants
  • Degrease using suitable HMG Prep Clean 2800 to remove grease and oils not removed with pressure washing alone
  • Existing coatings to be well adhered with all edges tight and well feathered
  • Rust/corrosion to be removed back to clean metallic appearance
  • Abrade to provide good adhesion
  • Wipe over with degreaser to remove loose debris from abrasion


For further information please contact Rawlins Paints on Tech - 0113 2455450 (option 2) or [email protected]


Health & Safety

  • Refer to the safety data sheet in the attachments section above and tin label prior to use
  • Suitable respiratory equipment should be worn when spraying
  • Contaminated rags, spray booth filters or other substrates should be segregated from other chemical waste, soaked
    with water or disposed of in a non-combustible container with tight fitting lid

Product Details

Data sheet

HMG Paints Limited
For Use By
Professional Use
Water / Solvent Based
For Use On
Structural Steel
Steel Fabrication
Mild Steel
Shot Blasted Steel
Galvanised Steel
Application Method
Standard / Ready Mixed
Single, Two or Three Pack
Single, Two or Three Pack
Pack Size
Mixing Ratio
Base: 95 - Thinner: 10
Touch Dry (at 20°C)
4 Hours
Dry to Recoat (at 20°C)
16 - 48 hours dependant on film build and conditions.
Fully Cured (at 20°C)
24 hours
16.6m² at 55 microns dft
Recommended Thinner/Cleaner
HMG Thinner 2611/2612
BDX Clear Primer Base: 1.318 g/cm³ - BDX Dark Grey Primer: 1.339 g/cm³ - BDX Light Grey Primer: 1.414 g/cm³ - BDX Off White Primer: 1.396 g/cm³ - BDX Red Oxide Primer: 1.395 g/cm³
Solids by Volume
BDX Clear Primer Base: 68.3 % - BDX Dark Grey Primer: 67.3 % - BDX Light Grey Primer: 71.6 % - BDX Off White Primer: 70.4 % - BDX Red Oxide Primer: 69.9 %
Heat Resistance (up-to)
120 °C
0.480 Kg/l
Shelf Life (from date of manufacture)
12 months from delivery date in original sealed containers
Recommended Dry Film Thickness
55 μm
Recommended Wet Film Thickness
100 μm
UN Number
Standard Colours
Base Type
Suitable For Use On
Suitable For Use On
Structural Steel
Suitable For Use On
Steel Fabrication
Suitable For Use On
Shot Blasted Steel
Suitable For Use On
Galvanised Steel
Suitable For Use On
Suitable For Use On
Mild Steel
Application Method
Application Method
HMG Paints LTD
Quick Drying
Product Type
Metal Primer
Product Type
Colour Family
Colour Family
Colour Family

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.

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HMG Synthetic BDX Primer 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

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