Premium quality clear polyester casting resin suitable for clear sculpture casting, object embedding, jewellery making and set design. The resin is supplied complete with free MEKP catalyst, measuring syringe and nitrile gloves.
Water clear polyester casting resin is a cost effective alternative to more expensive clear polyurethane casting resins. Its low viscosity makes it suitable for reproducing incredible fine surface detail when casting sculptures and also ensures excellent wet-out when encapsulating/embedding objects in clear resin to make objects such as paperweights. The resin is very low reactivity meaning that quite thick sections can be cast in one go without distortion or discolouration and the natural UV stability of polyester means that finished parts will not fade or discolour even after prolonged exposure to sunlight which is great for outdoor pieces.
Water clear Polyester Casting Resin also has the advantage over polyurethane casting resin that it is less sensitive to moisture and so it is often possible to achieve better results with certain kinds of embedments using a polyester casting resin compared to a polyurethane casting resin, particularly those which naturally have a high moisture content such as organic matter. Although polyester is less sensitive to moisture it is still important to ensure that objects to be embedded are as dry as possible and some preparation is required to get the best results when working with certain types of material (see accompanying datasheet for further information).
- Encapsulating / embedding objects (eg. paperweights)
- Jewellery making
- Water clear sculpture / artwork (glass-like castings)
- Set design features (eg. ponds, lakes etc.)
- Model-making / scenarios (eg. miniature lakes)
- Stained glass effects*
- Casting a semi translucent / tinted artwork*
*would require colour pigments
Pack Size and Contents
Our Water clear Polyester Casting Resin is available in 1KG, 5KG and 25KG packs; choose the pack-size you want from the drop-down list at the top of the page.
Also included in with all kit sizes is a measuring syringe, MEKP catalyst and nitrile gloves ensuring that you have everything you need to start casting right away.
For full instructions on using the product, including hints and tips on artistic techniques and advice for embedding different types of object please download our Water clear Polyester Casting Resin Instructions Datasheet.
Translucent Tinting Pigments
Our Waterclear Polyurethane Casting Resin can easily be tinted with our range of Translucent Tinting Pigments to create stunning colour effects from subtle tints to vivid, vibrant colours.
Simply add a drop or less of these special pigments to your waterclear castings for amazing colour effects.
Colour tinting in this way can bring vivid life to lighting prototypes, jewellery and artwork.
Choosing the Right Resin System (Polyester or Polyurethane)
Easy Composites stock two types of water clear casting resin; this polyester casting resin and a polyurethane casting resin. Both resin systems can be used for similar projects so which one is right for you? Use this comparison table to identify the most suitable product for your needs:
||Water clear Polyester
||Water clear Polyurethane
|Air Contact Cured Finish
||Clean and clear
||Adjustable (by ratio)
||Fixed, fast reaction.
|Pot-life (working time)
|Cure time / de-mould
||8-24hrs (depending on catalyst ratio)
||Yes, using polyester pigment paste
||Yes, using polyurethane pigment paste
|Maximum casting thickness
||75mm (per layer)
||15mm (per layer)
Transport and Delivery Information
This product cannot be shipped outside of mainland United Kingdom. Customers from outside mainland UK should not purchse this product; it cannot be shipped internationally.
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Can I use this in a silicone mould?
Yes, certainly. Both of our types of silicone could be used but generally you'll get better results when casting water clear resins (polyurethane or polyester) by using an Addition Cure Silicone Rubber.
The resin does not seem to cure as quickly when I cast thinner amounts. I don't see how this can have an effect?
Thickness will certainly effect the cure speed of a casting. In a thicker casting, the resin gives off heat as it cures, as it gives off heat it cures faster which in turn causes it to give off more heat which then causes it to cure faster. This process is called exotherm. In a thinner section this process is much less pronounced (in fact hardly occurs at all) which is why thinner sections will cure much more slowly than thicker sections and so explains why higher catalyst ratios (up to 3%) are used for thin castings when low catalyst ratios (down to 0.5%) are used for much larger castings.
Ambient temperature (the room temperature you’re working in) also has a significant effect on the cure time; working in cooler conditions the resin will take much longer to cure compared to working in warmer conditions. For this reason, catalyst ratio can also be adjusted to compensate for warmer or colder conditions.
I have purchased the polyester resin to dip cast a sheep heart specimen, preserved in formalin and then washed off and put in phenoxetol. How do I dry this product and how long should I leave before using the resin?
I'm not 100% sure I know what you mean by 'dip casting', maybe you mean encapsulate/embed (i.e. pour resin all around) or perhaps you mean something more like coating the specimen so that it's not suspended in a resin but instead still has its original shape, just with a plastic sealed coating?
If you do mean to encapsulate/embed it then this might need some experimentation because organic specimens can be quite tricky to encapsulate without adverse reactions with the resin. I think I would suggest simply patting the specimen dry very thoroughly and then dipping it in some un-catalysed then removing it and leaving it over night. The next day you can proceed with encapsulating it by putting it in your mould and pouring the resin around it. Remember that experimentation first with organic specimens is very important.
What I should use to flat and polish the surface of the cured resin?
You should be able to flat and polish the cast polyester resin just like you would any other plastic which means that you can use abrasive papers and polishing compound to polish and buff it to a gloss finish.
What do I use as a material in which to embed an object before pouring resin into a mould?
There wouldn't normally be a different material that you would use to embed the object in first. Some objects (particularly organic matter) need some extra pre-work before encapsulating them, such as dipping them in resin the night before, but they should not need a different type of resin or material for this purpose. Please take a look at the technical datasheet for much more info on this type of preparation.
Can you use this resin to encapsulate a terminal block within a junction box? Will it be able to withstand water and outdoor conditions?
In theory, yes; you could use a clear polyester resin as a 'potting' resin however polyesters are rarely used for this purpose for a few reasons - the main one being that there are quite a few materials (plastics) which could be attacked by the styrene in the polyester resin meaning that you could find insulators or components on a PCB being affected by the resin. Another reason is that polyester resins are subject to more shrinkage than alternatives such as epoxy and polyurethane. For this reason, most electrical potting is done using epoxy resin; it has excellent resistance to water, is incredibly unlikely to have any adverse reaction with other materials and has a very low shrinkage. We don't sell an epoxy resin specifically as a casting/potting resin but our EL2 Epoxy Laminating Resin used with our SLOW hardener would by fine for small to medium sized electrical potting applications.
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