In your bath oils or lotion bars and apres bath misters are intended to trap the water from your shower or soak in by using oils. Think of them as lotions without water, much like the lotion bar. As they are oil based, we won't use a preservative or other water based ingredients in our mix.
As usual, if you are intending to keep any oil based product longer than 3 months or plan to give them as gifts, please use 1% Vitamin E to keep your oils from going rancid. (I just found an emulsified scrub from THREE YEARS AGO. I preserved it well - no mold or other nasties - but it smelled awful because I didn't use Vitamin E. Having said that, if it were 50% Vitamin E it would have gone off, but still...rancid oils pong!)
IN BATH LOTION BAR
This one's easy. Make a lotion bar you like. When you step out of the shower (or even in the shower) you can rub this on your body to trap in moisture! Make it a nice size - bar of soap size - so you can rub it more easily.
APRES BATH OIL MISTER
You will want to choose oils that are non-staining to clothes and other fabrics, so your choices are pretty much sesame oil or fractionated coconut oil. You could use 98.5% sesame oil with 1% fragrance or essential oil and 0.5% Vitamin E in a spray bottle for an apres bath oil. Or for a lighter recipe 99% fractionated coconut oil with 1% fragrance or essential oil (you don't need the Vitamin E as the fractionated coconut oil has a very long shelf life.) You could combine oils - sunflower, sesame, fractionated coconut oil, and shea oil would be great - with your Vitamin E and fragrance or essential oils to create a wonderful, customized oil blend that your skin loves! (Keeping in mind that if you choose your oils, they may stain fabric or linens if you use a lot of them!)
BASIC APRES BATH OIL MISTER
98.5% light to medium oil
1% fragrance oil
0.5% Vitamin E
Get a spray bottle. Weigh the ingredients into the bottle. Label, use. Rejoice!
You could add a few things to this recipe - 10% IPM (isopropyl myristate, a very very light oil) will help the oils sink in quicker and feel less greasy. 10% cyclomethicone (a silicone) that will help trap in moisture. You could try shea oil or rice bran oil (these are NOT non-staining) if you want something a little heavier on your skin.
A bath oil is a liquid version of the bath melt - you bottle it, and add it to your bath as you need it.
80% oils of choice
20% polysorbate 80 (emulsifier)
Mix your oils together, add the polysorbate 80. Add 2% fragrance or essential oil and 1% Vitamin E.
You can choose any oils you wish - consider the oil posting for more information on the benefits, shelf life, and costs - and this is a great chance to play with some awesome fragrance or essential oils. Try citrus for uplifting, lavender & rosemary for calming and relaxing, or other blends of your choice. Mint is not a good choice for in-the-bath products - the tingle is great for some products, but not for a soaking blend!