I haven’t been particularly happy with the thinners I have been using with my GHSP. I would also like to use something with less chemicals. I’ve been investigating different oils and thinners and would like to test some different ones out with test parts I have. I know some have used Lineseed oil, but I have also seen walnut oil and safflower oil are options. They are all drying oils so it seems like it will work, but I’m unsure. I don’t mind ruining a test part if it doesn’t work but I was wondering if anyone has tried these with GHSP and what you thought of it? Also, does it have any long term side affects on the vinyl? I was planing on washing the oil off between layers but will have to experiment and see how it goes. Thanks for any input!