MasterCast resin TotalCast resin FAQ

Resin Obsession is pleased to add two new resins to our resin product family.  Both resins, made by Eli-Chem Resins UK give artists more options when creating their resin art.

–What is the minimum amount to mix?

20 grams, which is approximately 3/4 ounce.

–What is the maximum amount to mix?

Please mix no more than 4 kilograms at once.

–What is the pot time for these resins?

MasterCast resin has a working time of approximately 10 to 15 minutes, while TotalCast resin has a working time of approximately 7 to 10 minutes.

–What are the soft cure and hard cure times for these resins?

Cure times vary with how the resin is used, whether used as an artwork coating (thin layers) or in a mold (thicker layers).  Please review the technical data sheets with each resin’s listing to determine the likely soft and hard cure times for your specific application.

–Are MasterCast and TotalCast resins safe to use without a mask or breathing apparatus ?

Yes the resin is safe to use at ambient temperatures as it is VOC-free, low odour, non-flammable and contains no solvents.

–What is the coverage rate ?

Both totalCAST and MasterCast will cover 1 square meter per 500 grams of mixed resin ( 10.7 square feet per 18 ounces)

–How much mixed resin will I need?

Canvas size (centimeters)Canvas size (inches)Resin quantity per layer
10 x 154 x 675 grams
(2.6 ounces)
20 x 258 x 10250 grams
(8 ounces)
30 x 4012 x 16600 grams
(21 ounces)
45 x 6018 x 241.3 kilograms
(45 ounces)
50 x 6020 x 241.5 kilograms
(52 ounces)
60 x 8024 x 312.4 kilograms
(84 ounces)
91 x 12036 x 485.4 kilograms
(190 ounces)

–How long will will the resin last in unopened / opened containers ?

12 months in both cases.

–Do I need to wear safety clothing / equipment when working with resin?

While MasterCast and TotalCast resins are safe and user-friendly please be aware that they are still industrial chemicals, therefore we always advise that users observe good industrial hygiene such as wearing gloves and long-sleeved clothing.  Do not eat, drink or smoke near the resin as well.  A breathing apparatus or mask is not required at ambient temperature conditions.

–How do I measure and mix it ?

The ratio of the resins is 1:1 by weight or volume. Mix by stirring for 2-3 minutes until the mixture has a uniform texture and consistency.  Use the spatula to scrape the inside of the mixing container while stirring to free up any material which could be sticking to the inside walls with static.  Once mixed do not leave in the mixing containers for more than 4-5 mins as it will produce heat quickly in a small volumetric space, which will cause the resin to cure rapidly.

–I’m not sure which one I should use — MasterCast or TotalCast.  Can you help me decide?

Sure!  TotalCAST is best for coating existing artwork as its faster setting, more fluid in viscosity and enables bubble release better.  MasterCast is the resin to use for pigmenting and using with resi-blast as it has a longer open time to work with and manipulate.  For the experienced resin artist they can also use TotalCAST for this use as they will naturally work quicker and have a better understanding of processes and techniques. But for beginners, it’s better that they have the longer working time that is possible with MasterCast.  If you want to cast the resin into a mold, then TotalCAST is best.  For doming on pendants, rings, etc., MasterCast is recommended because of its high-build properties.

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–Do these resins have any shipping restrictions?

These resins can ship worldwide.

–How do air bubbles occur and how do I get rid of them?

MasterCast and TotalCast resins are de-gassed before containers are filled so any air that enters the mixture is caused solely by hand-stirring.  The vortex caused by stirring pulls air into the blend. Once poured over your surface, immediately pass hot air from a blowtorch, heat gun or hairdryer to dissipate bubbles.  A special air release agent is added into the formulation as well, which helps to expel micro-bubbles.

–If I add more hardener will the resin cure faster?

No it will not cure quicker, in fact it will not cure at all. The speed of cure is not regulated by the amount of hardener.  It is controlled by the amount of accelerator which we add into both components during the production stage.  Please do not deviate from the pre-set 1:1 mix ratio. To accelerate the curing process you can pre-heat the components and mix them while warm.

–Why are the levels slightly different in the resin and hardener bottles?

This is normal. We fill all our kits by weight but because the density of the resin and hardener is different it means they occupy a slightly different volumetric space.  So for example 1 kilogram of resin is around 950 milliliters in volume but 1 kilogram of hardener is 1 litre in volume.  That is why the levels differ marginally.  The Hardener component will always have a slightly the higher level in the bottle as it is less dense than the Resin component.  If you measure 1:1 by weight then you will finish both components at the same time. If you mix 1:1 by volume it will still work but you may end up with slightly extra Hardener.  Either they are manufactured with a margin of error of 15% so that you can make mistakes to this tolerance and the resin will still cure normally.

–I would like to know more about these resins.  What else can you tell me?

Lots!  Download the MasterCast resin and the TotalCast Resin information sheet

Learn more about MasterCast here:


Unpublished Blog Posts of Resin Obsession, LLC © 2016 Resin Obsession, LLC


Sharon France

I have used this resin I found it to be quite thick when stirring but it was great to use in my Xmas mould which came out perfect I will use this again as I like this better. I bought the tester kit first for £16.50. Hope you all give it a try.

Katherine Swift

Thanks for your comments Sharon. It’s new to me too, so I appreciate hearing about others’ experiences.

Alan Skilander

Hi, can you check the table of resin quantity as I think it is way off based on 500g per square metre. 91 X 120 cm is 1.09sq.m and should take 545g not 5.4kg. Having said that I don’t think I have ever got 500g per square metre coverage yet, but then I am relatively new to this.

Katherine Swift

Elichem (the manufacturer) has reviewed the coverage estimates and states they are accurate.

Karen at YaYa Studio

I’m confused by the two different coverage estimates above. One says “1 square meter per 500 grams of mixed resin ( 10.7 square feet per 18 ounces)” The other, “12 x 16″ needs 21 oz.” 10.7 sq. ft. vs. a little over 1 sq. ft. I realize that thickness can play a part, but not that much of a difference. I’m trying to estimate how costly this will be should I decide to go Large, say 3′ x 4′, for a large painting. This is an Expensive medium, but I love it and want to really explore it. However, if I need about $200 worth of resin for one painting…you get the picture…no pun intended. LOL

Karen Foster

This truly helps! I can now figure amounts needed for different thicknesses depending on the depth I want, and how much to mix for simply adding a layer to other paintings! Yay! You are awesome!!


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