Hey everyone. Today you'll learn why I never mix resin by eyeball, and how one cheap kitchen scale can save a whole pour.
I wouldn't mix resin without measuring by weight or ratio. I get why folks skip it. The bottles are right there. The mold is right there. You pour a little of this. You pour a little of that. It looks about even. You stir and hope.
Resin does not run on hope, y'all. It runs on chemistry. Part A and Part B have to meet in the exact amounts the maker planned. Close enough is not a ratio. Eyeballing is just guessing in a nicer outfit.
The pour that never hardened
I learned this one the sticky way. I had a small pour to do. Nothing fancy. I figured I had poured resin before. I could judge the amounts by eye. So I poured freehand, stirred it up, and filled my mold feeling pretty smart.
The next day it was still tacky. The day after that, still tacky. It felt like the sticky side of tape. It picked up dust. It picked up a fingerprint every time I checked it. Checking it was the worst part. I knew.
There is no fixing an under-mixed pour. You cannot stir yesterday's mistake. You cannot add a drop of hardener on top and call it cured. The piece went in the trash, mold and all got a long cleanup. The joke was on me, folks. Not on the resin. The resin did exactly what my bad measuring told it to do.
I have seen the same sad ending at craft tables since. A coaster that stays soft. A keychain that bends like rubber. Nine times out of ten, nobody measured. They eyeballed, and the chemistry kept the receipt.
Why the ratio is the whole ballgame
Resin cures when the two parts react together. Too little hardener and some resin never gets a partner. Too much, and the extra has nothing to bond with. Either way you get soft spots, tacky surfaces, or a pour that never hardens at all.
Here is the sneaky part. Ratios come in two languages. Some resins measure 1 to 1 by volume. Some measure 2 to 1 by weight. Weight and volume are not twins, because the two parts do not weigh the same per cup. Measuring a weight ratio with a measuring cup quietly changes the recipe. Read your bottle. It will tell you which language it speaks.
And no, extra hardener does not make it cure faster or harder. It just makes it wrong in the other direction. The label ratio is the recipe. Follow the recipe.
What I do instead
First, I read the ratio on the bottle out loud. Say it is 2 to 1 by weight. Now I know my math before anything gets poured.
Second, I do the numbers before I pour. For a small 60-gram batch at 2 to 1 by weight, that is 40 grams of resin and 20 grams of hardener. Total 60. Written on a sticky note. No math in my head while I am pouring.
Third, I set my cup on a kitchen scale and press tare so it reads zero. I pour the resin to 40 grams. I tare again, or just add up to 60 total. Slow pours near the end. A gram or two over, I stop and adjust my plan for the extra, not pretend it did not happen.
If your resin measures by volume instead, use a cup with clear ratio markings. Pour Part A to its line. Pour Part B to its line. Same idea. The marks do the measuring, not your eyes.
Fourth, I mix slowly for the full time, about 3 to 5 minutes for most small batches. Slow, because fast stirring whips in bubbles. I scrape the sides. I scrape the bottom. Unmixed resin hides there, and hidden resin never cures. Some folks pour the mix into a second clean cup and stir one more minute. That is a fine habit too. Completely up to you.
Fifth, I pour right away and leave it alone. No poking it to check. It will tell you it cured by being hard tomorrow, not by your thumb tonight.
Here is your permission beat, folks. Your first measured pour might still have a bubble or two. That's fine. It doesn't have to be perfect. You're your own worst critic. Measuring just removes the one mistake you cannot fix later. Take your time. It's not a race.
You have options here. Graduated cups cost pennies. A pump top meters each part for you. A little kitchen scale is my pick for weight ratios. Any honest measuring beats a confident guess.
Don't take my word for it — watch this:
Watch How Much Epoxy Resin Do You Need? EASY TRICK! on YouTube — it walks through weighing out a 2 to 1 resin mix on a kitchen scale, 144 grams of resin to 72 grams of hardener.
You can read more from this series at What I Wouldn't Do as a Crafter.
Thanks for spending a little time with me today. Read the ratio. Weigh it or mark it. Mix it slow and full. If I can do this, y'all can do it.
We'll see you next time. Bye.
— Corey, Chief Quilter, Linda's Electric Quilters
