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How much hardener?

RKD understand that this element causes most concern when installing a fibreglass flat roof.

Indeed this is the question most asked by trade and DIY alike and it is the area where most subsequent issues arise in the roofing installation.

So first tip

  1. Always make sure that you thoroughly mix catalyst into resin and topcoat

  2. Always use a proper catalyst dispenser to ensure your measure is correct

  3. Remember too much catalyst can cause failure to cure just as easily as too little.

  4. Pot life - resin will cure quicker if left in the bucket (about 20 mins) so mix little and often as you go.

  5. The climatic conditions (temperature) will effect curing time - generally the hotter the faster

Most queries arise because there is not an exact definition of how much catalyst to resin as it depends on the temperature but a good guide is

1% is considered a slow mix used in hot weather and direct sunlight

2% is considered ideal used in spring/ autumn warm weather

3% is considered a fast mix used in cold weather

4% used in winter weather

So what does this mean in terms of measure

1Kg @ 1% is 10 ml therefore 5kg is 50ml and so forth

1Kg @ 2% is 20 ml therefore 5kg is 100ml and so forth

1Kg @ 3% is 30 ml therefore 5kg is 150ml and so forth

1Kg @ 4% is 40 ml therefore 5kg is 200ml and so forth

Also you can obtain Winter and Summer catalyst versions - make sure you check which one you have before starting.

Here are the full tables of catalyst addition values

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