Truthfully, coolant is like as*holes, everyone has there own. Call a local tooling rep, see what they have. Ask for a free sample, they will usually give away a 5 gallon pail for you to try. I personally think the Trim products are ok, but i can't stand the perfume they put in them, makes me sick. Finish difference will be minimal in aluminum and plastic. Copper, and other materials make a big difference. Just remember, add coolant to the water, not water to the coolant.