It looks like glassing your boards with epoxy resin has become the more popular choice over polyester resin based on our records this year. 2-3 years ago we’ve had plenty of experienced poly guys come into the shop stating they’ll never use epoxy for one reason or another. Today most of them have added epoxy to their skill set and some of them now say “I’ll never use polyester resin again! It stinks, it’s weak, it’s hazardous… epoxy’s so much nicer to work with.”
Notice I used the words skill set to describe the act of using epoxy. Skill comes from knowledge and experience. So here’s a little more epoxy knowledge to help elevate your epoxy game.
The Golden Rule of Epoxy #1 - MEASURE Epoxy Resin ACCURATELY
For years I’ve been telling people this little anecdote about epoxy to help them understand the importance of measuring epoxy thoroughly:
“Pretend the resin and hardener molecules are dancing at a party in the mixing bucket. You want everyone to hold hands, that is where the strength is (this is called cross-linking). Anyone who is not paired up is floating in there, useless, in the way, and causes a soft spot in the cure. So an accurate mix ratio is critical to ensure everyone is holding hands and there are no extra stragglers screwing up a fun party.”
The epoxy systems we sell, Resin Research and Entropy Super Sap are both measured and mixed at a 2 parts Resin to 1 part Hardener mix ratio by volume (in a graduated mixing bucket).
But to be the most accurate and have a full, durable cure to the epoxy it is best to measure by weight with a digital scale.
Resin Research products are mixed at a 2.2 parts Resin to 1 part Hardener by weight (100 parts resin : 45 parts Hardener to be more specific)
Entropy Super Sap is mixed at a 2.1 parts Resin to 1 part Hardener by weight (100 parts resin : 47 parts Hardener)
Greenlight has used and evaluated many different types of digital scales over the past 11 years and now offers the most accurate, reliable, and affordable digital epoxy scale on the market.