[richardfields112]

Let’s start off with a little geography. What is a meter? It is the distance from one of the poles to the equator divided by ten million. Therefore, the earth’s circumference is 40 million meters or 40,000 kilometers (x 5/8 = 25,000 miles). (A little trivia here: since a meter is a fraction of the earth’s circumference, there is a direct relationship between a nautical mile, which equals one minute of latitude, and a kilometer. One kilometer = 0.54 nautical miles. But I digress…)

[UnWar]

Now run a test batch. Measure out 50g of resin and catalyze it at 1%. Mix in the MEKP and stir for one minute. Let it stand, checking it every five minutes for signs of gelation. Gelation has started when the resin starts to cling to the mixing stick, gets stringy or forms a lump in the mixing cup. This should happen in about thirty minutes, give or take ten minutes. Since we left all of the resin in the cup, this test will produce the shortest gel time you can expect from this batch of resin at this temperature and percent of catalyst. You can expect longer gel times when you are laminating because there will be a smaller thermal mass. You should run this test with each gallon of resin you promote, as there are other factors for which we cannot account. [links]

[bravenec]

So your resin is more than two months old and your gel times are getting longer. What to do? Try re-promoting it. To do this, add one half your original quantity of promoters by volume. For example, if you have half a gallon left, add one fourth of your original promotion (1/2 x 1/2 = 1/4). You can re-promote resin twice, effectively doubling the percentage of promotion chemicals.

[kathysafari]

Catalyst is sold in bottles of 10 g, 20 g, 100 g etc. ready weighed out. It is important to add the correct amount of catalyst.

[jlebeau]

Where catalyst weights become critical is that vol% is slightly more than weight %.
i.e. S.G. of catalyst = 1.16

[planetPlosion]

1kg (1000g) of Rubber requires 50ml of catalyst
500g of Rubber requires 25ml of catalyst
100g of Rubber requires 5ml of catalyst
50g of Rubber requires 2.5ml of catalyst here

[CalypsoL]

For an effective laminate, it is essential that the glassfibre material is thoroughly “wetted-out” with Resin. The amount of resin needed to do this varies from one glassfibre material to another. The following table shows the amount of Resin needed per square metre of fibreglass material.

[Pubulis01]

Nivitex have various guides available for the DIY person that will help you with your next project from costings on projects to using various fibreglass products for mould making etc.

[JohnVChampion]

With General Purpose Resin (but not Gelcoat), the rate of cure can be slowed down by halving above ratios giving you a 1% liquid catalyst percentage per weight of resin. This can be useful in very hot weather, when the resin might otherwise cure too quickly you can then double the liquid catalyst in the table above giving you a 3% catalyst % per weight of resin. here

[ducki2p]

Please provide values below to convert drop to milliliter [mL], or vice versa.

[Limpan94]

1 drop = 0.05 mL
1 mL = 20 drop

[famoustreat]

Example: convert 15 drop to mL:
15 drop = 15 × 0.05 mL = 0.75 mL here