Bio-Epoxy Resin Showdown: Resin Research Bio vs. Entropy Super Sap

Entropy Resin Vs. Resin Research
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When I started Wave Arcade, I knew that bio-based epoxy resin was going to be a key component to making my fins and boards.

Bio-based epoxy resins are derived from plants and result in an epoxy that’s safer to make, safer to use, and that carries a much lower carbon footprint than polyester resins or chemical epoxies.

I’ve had about equal experience using both Entropy Resin Super Sap One and Resin Research BIO epoxy resins.

This page serves to compare the two and provide some of my experiences working with them.

Both are 2:1 resin:hardener epoxy systems, and I’ve had success with both of them.

A quick table to compare the two epoxies is probably the easiest way to do this, here we go. This table will first show a side-by-side comparison of the two bio-resins based on information from their website and my own experience. Information assumes fast hardener is used.

Entropy Resin
Super Sap ONE
Resin Research
BIO
Bio Content (When mixed w/ Fast Hardener30%21%
ViscosityLow (1000cP @77°F)Medium (399-600cP @ 77°F)
ColorSlight Amber/ClearSlight Blue/Clear
Tack Free Time4 hours3 hours
Recommended Full Cure7 days2-7 days
Pot Life25 mins25 mins
Price (1.5 gallon kit)~ $165~ $140

Both bio-based resins are pretty comparable on most items listed above.

In my experience, they’ve both produced great results in terms of workability, finishing, and end-product appearance and strength.

Here are some of my anecdotal observations of the two epoxies, take these with a grain of salt:

  • I experienced amine blush after cure and during sanding with Entropy Resin Super Sap more so than I have with Resin Research BIO – this could be due to my experience with epoxy improving over time or ambient temperature and humidity during curing.
  • When working with hemp cloth, I preferred using Resin Research BIO.
  • I seem to experience more fish-eyes/bubbles with Resin Research BIO than I did with Super Sap – again this could be due to my experience level or ambient temperature.
  • I’ve been able to source Resin Research BIO for a little bit cheaper than Entropy Super Sap.

Honestly, after using both resins – I don’t have a strong preference either way. Both have their strengths and weaknesses, and both require about equal finish work for a good final product (just like any epoxy).

I’ve been satisfied with the results from both – both in terms of working with them and surfing the final products.

I’m calling the final result a draw – both companies offer great options for bio-content epoxy resins and I’ll probably continue to use resins from both Resin Research and Entropy Resins moving forward.

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