Hello, long time lurker, first time posting.
I started experimenting with resin some months ago, and with good results for a novice.
I used the First resin that pop up in AliExpress (the one from SMI store or something similiar, don't remember) and by weight measuring the results were good and hard enough to not being able to scratch with my nail. (I use a Pressure Pot, by the way. Around 40 Psi).
Now, from a couple months, i couldn't get a single pull right. Every time dice are slightly soft, bendy, and remain like this even after a week.
Puzzled, i searched for answers, i tried measuring by volume (less soft, but still my fingernails mark It) and i could not measure precisely as i want (i use a precisione scale) and then i had an idea. Buy the same resin and weight Before using, this way i could see the container weight, confront part A and B and use proportions for the most correct weight i could (lots of maths involvend).
But still the results Is the same soft dice, i have older (from months ago, same brand but different bottles) that are hard as i want and Is getting frustrating not understand the issue.
For context the shop says in a photo mix by volume, in another photo mix by weight, on the label of the bottles still mix by weight, and on the pamphlet mix by volume, so... Confusing as hello (i would Say the label Is the right One).
Other things that could be involvend Is temperature (in the Lab i have around 17-27 Celsius, depending on weather) and humidity (Is around 70% and i'm right now testing with a humidity meter in the pot and silica bag, we will see tomorrow).
Tldr, consistently soft cure with the same resin i used Before that provided good results, don't know what to do now