It works good. It helps the decals to stick to surfaces. I always use a 50/50 mix of hot water and vinegar to soak my decals in. Also, I brush a little of vinegar on the surface of the model just before sliding the decal.
Actually, if you take a bottle of Micro-set, you'll notice it smells exactly like vinegar. Micro-Sol is something different and much stronger tough.
And when all those products do not work, I simply brush some "Future" on the surface and slid the decal onto it.
Have fun.
No matter where you go ....... there you are.