Willy, you have to thin it down quite a bit. As far as loosing detail goes, it will happen to the finer details like scale patterns if you don't score them a little more with a neddle-like tool before you start to seal.
If you make your mold out of resin you will get good detail recovery. The downside to resin is the cost compared to pop and if you pour a lot of baits out of it at one time the mold will heat up, and can warp a little. Also, the higher heat will cause the smell of the resin to pass to your baits.
I guess everything is half a dozen of one and six of the other.lol
www.novalures.com