Good. My first though of your initial post was your damage was literally deep and to the ski core where dropping candle to fill the void should be a slow and methodical process if even possible with a candle. Nevermind.
However as I mentioned prior you appear to fit the other end of the extreme with a 2 inch by 1/16th of an inch at deepest point “cheese grater” damage being very common (I assume the cut is running parallel to the ski edge)
Here is my process for your consideration: After a good citrus cleaning take another look at the interior of the cut. If it appears smooth through length take your Xacto knife and with the knife point lightly prick some spots evenly along the cut. These small innocuous indents will act to better anchor your new ptex application. Now back to your ptex candle. I assume both your candle and ski base are now at room temp. I will also assume you have a plate or non flammable board that can sit on top your ski base directly next to the tip side of your cut. This plate will act as the initial candle drop point helping you to tune the candle flame to blue and eliminate as much carbon by-product as possible just before your slow pass onto the cut from tip to tail. This pass should have the candle close to base and just near a stalling of the candle burn and drop moving at a speed that allows a slight overlap process to the prior drop point. At the depth you have described as 1/16 of an inch at deepest point, your one pass should do the trick again provided you have some prior drop overlap. The end result should look uniformed giving an ocean wave appearance. Observe cooling from the outside moving inward in your shop room which is at room temperature.
Now here is where individuals can really differ on the next step IMO. For shallow cuts like yours a deft feathering approach is needed to insure you do not pull out what you just put down. In that regard I allow cooling just to a certain point where I begin a very fine light handed sanding, not scraping, using a small patch of 3M medium drywall screen. Going one light stroke tip to tail at a time, I bring the ptex waves down so to speak. Normally you’ll see the outside edges of your fix begin to smooth with perhaps the center of the fix demonstrating an indent. Once at that point I use a finer sand paper and with feather touch address the fix careful to work only the damage area. Slow is the key with a touch of a brain surgeon. If an indent is still noticeable say at center of fix, I will again lightly Xacto “prick” and repeat entire process. Once satisfactory for you, do your final wax and scrape routine. Note that base structure is not of concern for me with the small area and only addressed at normal seasonal change over.
This process has worked solidly for me for over the years where I perhaps obsess more than most with fine cuts as I find slow, steady and delicate works.