"...Can I add more lye to the gel now and repair it?..."
Yes, you can add more lye, but do so carefully and slowly. You can estimate the amount of lye needed -- you know how much lye you actually used. Recalculate the recipe with 3% superfat, 90% KOH purity and find out the amount of lye you should have used.
Lye to add = (Lye you should have used) - (Lye you actually used)
Dissolve the lye you want to add in 3 to 4 times the amount of water as KOH. An exact amount of water is not super important -- just get it close.
Example:
You want to add 12 g KOH. Dissolve the lye in 36 to 48 g of water.
Add about half the lye solution to the soap paste. Stir the lye into the paste thoroughly. You may need to heat the paste gently so it becomes softer and easier to stir. Wear your usual safety gear, including eye protection -- stirring the lye solution into soap paste may splash a bit more than you might expect.
Allow the KOH time to react with the excess fats -- let it sit overnight if you have the patience. See what the soap looks like -- is there still separation? If there is, add about half of the remaining lye solution to the soap. Stir well, let sit, see what happens. If needed, add the last bit of lye solution and repeat.
"...if I use soapcalc then can I substitute glycerin to water?..."
Yes, you can. Soapcalc does not care what you use for the "water" in a soap recipe. You can do one of several things:
Use 100% water. The KOH will dissolve in water easily. The recipe will be slow to trace.
Use 100% glycerin. The KOH will be difficult to dissolve. The recipe will trace and saponify quickly.
Use 1/2 water and 1/2 glycerin. Dissolve the KOH in the water. It will dissolve easily. When the KOH is fully dissolved, add the glycerin. The recipe will trace quickly.
Use some other proportion of water and glycerin such as 1/3 water and 2/3 glycerin, etc. Dissolve the KOH in the water. When the KOH is fully dissolved, add the glycerin. The recipe will trace quickly.
My vote is for a mixture of water and glycerin, because I think you get the best of both worlds -- the KOH dissolves easily and the soap traces quickly. I have two tips if you want to try this:
1. To properly dissolve the KOH, use at least as much water as KOH. If you use more water, that's fine, but I would not use less.
2. To make the soap paste easier to work with, the total amount of Water + Glycerin should be 3 to 4 times the KOH weight. You can use less than that -- some recipes call for only 2 times the KOH weight -- but a paste this dry can be hard to stir and dilute.
Example:
A recipe calls for 125 g of KOH.
You choose to use 125 g of water to dissolve the KOH.
You also choose to use 3 times the KOH as your total liquid, so:
Total liquid = 3 x 125 g = 375 g
Glycerin = 375 - 125 = 250 g
I hope this helps!
Yes, you can add more lye, but do so carefully and slowly. You can estimate the amount of lye needed -- you know how much lye you actually used. Recalculate the recipe with 3% superfat, 90% KOH purity and find out the amount of lye you should have used.
Lye to add = (Lye you should have used) - (Lye you actually used)
Dissolve the lye you want to add in 3 to 4 times the amount of water as KOH. An exact amount of water is not super important -- just get it close.
Example:
You want to add 12 g KOH. Dissolve the lye in 36 to 48 g of water.
Add about half the lye solution to the soap paste. Stir the lye into the paste thoroughly. You may need to heat the paste gently so it becomes softer and easier to stir. Wear your usual safety gear, including eye protection -- stirring the lye solution into soap paste may splash a bit more than you might expect.
Allow the KOH time to react with the excess fats -- let it sit overnight if you have the patience. See what the soap looks like -- is there still separation? If there is, add about half of the remaining lye solution to the soap. Stir well, let sit, see what happens. If needed, add the last bit of lye solution and repeat.
"...if I use soapcalc then can I substitute glycerin to water?..."
Yes, you can. Soapcalc does not care what you use for the "water" in a soap recipe. You can do one of several things:
Use 100% water. The KOH will dissolve in water easily. The recipe will be slow to trace.
Use 100% glycerin. The KOH will be difficult to dissolve. The recipe will trace and saponify quickly.
Use 1/2 water and 1/2 glycerin. Dissolve the KOH in the water. It will dissolve easily. When the KOH is fully dissolved, add the glycerin. The recipe will trace quickly.
Use some other proportion of water and glycerin such as 1/3 water and 2/3 glycerin, etc. Dissolve the KOH in the water. When the KOH is fully dissolved, add the glycerin. The recipe will trace quickly.
My vote is for a mixture of water and glycerin, because I think you get the best of both worlds -- the KOH dissolves easily and the soap traces quickly. I have two tips if you want to try this:
1. To properly dissolve the KOH, use at least as much water as KOH. If you use more water, that's fine, but I would not use less.
2. To make the soap paste easier to work with, the total amount of Water + Glycerin should be 3 to 4 times the KOH weight. You can use less than that -- some recipes call for only 2 times the KOH weight -- but a paste this dry can be hard to stir and dilute.
Example:
A recipe calls for 125 g of KOH.
You choose to use 125 g of water to dissolve the KOH.
You also choose to use 3 times the KOH as your total liquid, so:
Total liquid = 3 x 125 g = 375 g
Glycerin = 375 - 125 = 250 g
I hope this helps!