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HMG Knowledge Base


Touch Dry vs Hard Dry vs Full Cure

KNB0043
13/10/2014

Touch Dry vs Hard Dry vs Full Cure

he coatings industry uses a variety of terms to describe the ‘drying’ & ‘curing’ process of paints, sealants & inks. It is important to understand the difference between the terms ‘Touch Dry’, ‘Hard Dry’ & ‘Full Cure’, that are often quoted in our literature.
HMG Guide To Achieving The Correct Colour

KNB0042
30/04/2013

HMG Guide To Achieving The Correct Colour

Achieving the right colour and shade can be difficult for many reasons. The HMG Colour Library has produced this guide to help you achieve the correct colour.
Aquaguard 4000N Chemical Resistance

KNB0041
31/01/2013

Aquaguard 4000N Chemical Resistance

Knowledge Base article for Aquaguard 4000N Chemical Resistance
Film Thickness Best Practices

KNB0040
06/06/2012

Film Thickness Best Practices

HMG Technical Data Sheets 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.
The Use of Cobalt in Coatings

KNB0038
08/02/2012

The Use of Cobalt in Coatings

Knowledge Base article for The Use of Cobalt in Coatings. The article was distributed by the British Coatings Federation, in February 8th 2012
Water Based Paints Winter Care

KNB0037
04/10/2011

Water Based Paints Winter Care

A few quick tips on how to care for Water Based Paint during the cold months.
Lead in Painted Surfaces Guide on Repainting and Removal

KNB0036
20/09/2011

Lead in Painted Surfaces Guide on Repainting and Removal

A good refrence guide for when dealing with Lead in Painted Surfaces whilst Repainting and Removing for DIY and Professional Painters and Decorators
Wood Coatings Terminology Guide

KNB0035
12/04/2011

Wood Coatings Terminology Guide

The Wood Coatings Terminology Guide is designed as an introduction to common terms used in the industry.
BCF Guidance on Spontaneous Combustion

KNB0034
26/07/2010

BCF Guidance on Spontaneous Combustion

The British Coating Federations (BCF) guidance on Spontaneous Combustion. Spontaneous combustion is the ability of certain materials to ignite without the presence of any ignition source such as a flame, spark or heat. This could lead to a major fire and its inherent consequences.
Spontaneous Combustion

KNB0033
03/06/2010

Spontaneous Combustion

A look at Spontaneous Combustion, what is it and how does it occur???
The Cold Wall Effect

KNB0031
15/02/2010

The Cold Wall Effect

Often we have to advise people to be cautious when specifying for areas where the temperature on one side of the coating is substantially different from the one on the other side.
Blistering The Causes and Prevention

KNB0030
15/02/2010

Blistering The Causes and Prevention

One of the complaints levelled at all paint manufacturers concerns moisture blistering, which is probably one of the hardest problems to explain to the repairer on the bodyshop floor. This article will explore and hopefully explain the problem in more detail.
Surface Preparation And Product Application

KNB0029
18/08/2009

Surface Preparation And Product Application

It has been indicated by The British Iron & Steel Research Association that surface coating applied to blast cleaned substrates may be expected to last five times as long as the same surface that had been weathered, then manually wire brushed.
Superthane Resistance

KNB0028
11/08/2009

Superthane Resistance

The chemical and solvent resistance of Superthane films has been tested on the following build-up applied to sandblasted iron bolts.
Colour Advice

KNB0027
11/08/2009

Colour Advice

Users are advised that the actual paint colour from the container might not be identical to that shown on shade cards, brochures or in photographs. The differences can be caused by a number of factors that will result in colour variations, these being different substrate, different level of gloss which will affect the perceived colour and the level of lighting.
Pictorial Surface Preparation Standards For Painting Steel Surfaces

KNB0026
20/05/2009

Pictorial Surface Preparation Standards For Painting Steel Surfaces

It has been indicated by The British Iron & Steel Research Association that surface coating applied to blast cleaned substrates may be expected to last five times as long as the same surface that had been weathered, then manually wire brushed.
Plastic Recycling Codes

KNB0025
19/05/2006

Plastic Recycling Codes

The following is a list of plastic recycling codes, universally used in the plastics industry. The codes can be used to determine a type of plastic and so identify what surface coatings will adhere to that surface.
Abbreviations of Plastics

KNB0024
19/05/2006

Abbreviations of Plastics

The following list gives the abbreviated & full names of a wide range of plastics in common & uncommon use in industry today.
C71 Speedline Resistance

KNB0023
19/05/2006

C71 Speedline Resistance

Knowledge Base article for C71 Speedline Resistance
Epilife Resistance

KNB0022
19/05/2006

Epilife Resistance

Knowledge Base article for Epilife Resistance
CrystalSeal Resistance

KNB0021
19/05/2006

CrystalSeal Resistance

The following information is based on laboratory tests and to best of our knowledge is accurate. However, it is recommended that customers satisfy themselves as to the performance under specific service conditions.
Time To First Maintenance

KNB0020
19/05/2006

Time To First Maintenance

The time to first maintenance of a product can be described as the length of time before rectification of the product is required. This does not mean the time elapsed to a point where the paint system has degenerated to a widespread breakdown.
Cross Hatch Test Classification

KNB0019
19/05/2006

Cross Hatch Test Classification

The idea behind a cross hatch adhesion test is to ascertain the level of adhesion of a particular coating or number of coatings onto a substrate. The cross hatch test is a pattern of right angle cuts in the paint surface through to the substrate.
Coating Swimming Pools

KNB0018
19/05/2006

Coating Swimming Pools

Coating swimming pools has more than its fair share of problems in comparison with other industries such as vehicle refinish, rail, marine and general industrial applications. Every year manufacturers of pool paints can count on hearing about disasters that have occurred when end users have paint peeling, blistering or failing to dry, amongst other problems.
Accelerated Weathering Versus External Exposure

KNB0017
18/05/2006

Accelerated Weathering Versus External Exposure

Often, paint manufacturers are asked, "How many months or years of 'normal' exposure compare to an exposure test in an accelerated weathering tester?" The quick answer is that it is theoretically impossible to equate a known number of exposure hours in a QUV, cycling humidity or salt spray test machine to external exposure.
JD/11/77 Code of Practice

KNB0016
18/05/2006

JD/11/77 Code of Practice

This Note refers to paints in which an organic isocyanate has been used as a constituent, or is added as part of a two-pack system. The special properties of such paints depend upon the reaction between this isocyanate and a substance providing hydroxyl groups or other reactive hydrogen atoms. In some cases, the substance may be water vapour in the atmosphere.
Toy Safety Regulations

KNB0015
18/05/2006

Toy Safety Regulations

Whilst these regulations strictly only apply to toys and articles intended to be sucked or chewed by children, they are often referred to in the context of other health protection issues. Importantly, the Regulations apply to the toy or article itself as placed on the market.
Personal Protective Equipment

KNB0014
18/05/2006

Personal Protective Equipment

HMG suggest the following precautions are followed when sanding or abrading painted surfaces.
Hazards and Preventative Methods of Paint Spraying

KNB0013
18/05/2006

Hazards and Preventative Methods of Paint Spraying

When dealing with paint, potential hazards exist.
Preparation of Concrete Floors Prior to Coating

KNB0012
18/05/2006

Preparation of Concrete Floors Prior to Coating

In the case of newly laid concrete it is important that the concrete has been laid for a minimum of 29 days before considering applying a coating. The moisture content of the concrete should be below 6%. The main problem with the new concrete floors is the weak top surface layer known as laitence.
Preparation and Painting of Galvanised Steel

KNB0011
18/05/2006

Preparation and Painting of Galvanised Steel

Galvanising is a form of anti-corrosion treatment for steel. The process involves the steel being immersed into molten zinc at a temperature of 450ºC. The benefits of this process are that it provides a corrosion resistant finish to the steel that can last up to 30 years depending on the quality if the galvanising process and the location of the finished item.
Scotch Brite Grades

KNB0010
18/05/2006

Scotch Brite Grades

Colour, application and the finish produced of Scoth Brite Grades.
Prep Cleaning Techniques

KNB0009
18/05/2006

Prep Cleaning Techniques

The reason for pre-cleaning substrates that are to be coated is to remove grease, oil, silicones, wax & and any other contaminant. If this practice is omitted there is a significant risk that the ubsequently applied coatings will suffer from a lack of adhesion.
Practical Application Conditions

KNB0007
18/05/2006

Practical Application Conditions

The effect of humidity and temperature on paint application and storage.
Theoretical Coverage Chart

KNB0006
18/05/2006

Theoretical Coverage Chart

The following chart gives a theoretical coverage in square metres per litre, based on volume solids. The theoretical coverage is an approximate calculation only, as in 'real life' situation, transfer efficiencies vary between 50-80%. The use of HVLP (High Volume Low Pressure) equipment correctly adjusted will always improve transfer efficiency.
Temperature Scale

KNB0005
18/05/2006

Temperature Scale

A quick ready reckoner calculating temperature in Centigrade and Fahrenheit.
Overcoating Schedules Explained

KNB0004
18/05/2006

Overcoating Schedules Explained

Our Technical Data Sheets show an overcoating time that must be adhered to, to ensure sufficient curing of the coating prior to subsequent coatings are applied.
Coverage Rates Explained

KNB0003
18/05/2006

Coverage Rates Explained

The theoretical coverage rates shown on HMG Technical Data Sheets are calculated from the solids content by volume and are relevant to application onto a non-porous surface. Each product is individual and has a particular coverage rate; even different colours of the same product may have different coverage rates dependant on the amount of pigmentation.
Condensation

KNB0002
17/05/2006

Condensation

Most of us have been blessed with the experience of pouring an ice-cold beer into a tall glass, on a hot summer day. While lifting the refreshing drink to our dry lips, we have enjoyed the feel of the cool glass and the sight of the moisture and droplets forming on the outside of the glass.
Aerosol Technical Information

KNB0001
17/05/2006

Aerosol Technical Information

Shake can for a minimum of 2 minutes prior to use ensuring that the contents are fully mixed. A trial sample should be done prior to application to guarantee correct colour & sheen. Hold the can 10 - 20cm from surface to be sprayed, moving the can steadily in a straight line, overlapping slightly on each pass.