Hello, I've been making candles for 5 years and lately, I've been noticing at an 'oil slick' effect on the top of my candles. Tops are really smooth and looks nice, but there is a swirly oil 'sheen' when light reflect off the surface as if there is a very thin layer of oil resting on the top. Any idea on how to fix this? Or is this the new normal? This seems to be the case with all the FOs I try (from several different companies as well as my own blends). Here is my process:
Wax: GB 464, Heating to 190 degrees, adding 9.5% FO immediately, stirring for 3 minutes, pouring at 135 degrees.