u/Steely06

So I seem to be having some problems with curing. This is only my second time doing a silicone mold and I had a similar problem the first time. for the first time and this time as well I am using a 3-D printed piece. The first time I used filler primer and sanding to smooth the 3-D print before making the mold. I was having curing problems that time as well and based on where the uncured areas were I assumed it was probably not reacting well with the filler primer so I sprayed it with a gloss black coat and that seemed to fix the problem. This time around I’m using a 3-D printed piece that is spray painted with a gloss black and I seem to be having curing problems. This is my first time using this silicone. It is smooth on mold star 30 and I let it cure for about six hours and 30 minutes.

EDIT: I just wanted to add that this in not a resin 3d print it is an FDM print.

I’m messing around with vapor smoothing for the first time and I’m running into some issues. I lined the whole box with paper towels covered in acetone when I pulled the part out the bottom part was overdone while the top hadn’t been smoothed at all. knowing that acetone is heavier than air, I decided to just put acetone, soaked paper towels at the top half of the box and let it sit in there for about 30 minutes two separate times and nothing happened. The top still looks exactly the same. All the videos I’ve watched about this. No one’s really talked about this being a problem. I’m wondering if it’s because I’m standing it up and maybe it’s just too tall. If anyone has any advice on how to get a more uniform smoothing that would be awesome!