As a Glasair Sportsman builder, I'll chime in here.
Silpruf is indeed a silicone-like material, rubbery, flexible. In thin layers it has no adhesive bond strength at all, you can just rub it off with your fingers. Get some thickness and its characteristics seem to change exponentially. I glued together two pieces of .032 6061 aluminum with a 1/8" thick x 3/4" wide bead of Silpruf. Ended up destroying the aluminum trying to get the pieces apart.
Silpruf is fairly "runny" and has a long cure time. If you want to do a neat job, that long cure time is critical. Cleaning up, faying out, smoothing etc takes some time. The windows in our Sportsman look like they were installed in the Gulfstream factory rather than a homebuilder's hangar.
The video series referenced previously was put together by "some guy" named Zach Chase of Fibertech Composites. He is a composites guru and he pioneered this method of taping, masking, color-saturating the inside of the windows, etc. I received instruction from him directly, long before those videos were posted to Youtube. His method is pretty much foolproof if you follow it. Cut corners and your results may not be what you were hoping for.
If using Zach's technique, I will caution about the color of the sealant used. From an aesthetics perspective, we want our eyes to be drawn to the gorgeous, sexy, flowing lines of our aircraft. Use of a dark color of window sealant produces the opposite effect by starkly outlining and highlighting the windows. We then focus on the windows rather than the flowing lines of the aircraft. Our eyes tend to get drawn to those things that stand out the most (gee, ever try using BOLD text to get attention? - that's because our eyes are drawn to things that stand out!). Same deal for dark window sealant. I should likely mention that Craig from SchemeDesigners also cautions against dark outlines for windows, doors or other features. Since he's a pro in the business I tend to follow his advice.
In the Glasair aircraft, the "aluminum" color of Silpruf seems to be the go-to color and in fact is what we used on our Sportsman. Unless one has a very dark paint scheme in mind, the use of a very dark window adhesive will likely produce a less-than-pleasing visual effect.
I should also mention that Silpruf has a "best before" date which must be respected. If ordering on line, ensure the vendor provides you the "best before" date before finalizing the transaction. The stuff typically is in the $8-$14/tube price range. For an RV10 you will likely need 4 tubes. Buy 6 to be sure. Yeah, sometimes we do dumb things like leaving the caulking gun pointed nose down while a pile of material builds up on the floor under it. Nah, that would never happen to me. Never!