Look for Minnflyer's "Got Smoke" article.

The Slimline stuff works great.

By the time you are done adding the second battery, smoke tank ( the larger the better, you'll see! ), tubing, smoke muffler and/or heating coils, etc. you will be adding a fair amount of weight back on the plane.

I purposed ommitted the smoke system on the Skybolt to conserve it's weight, even though I had purchased a full setup for it.

The .91 works ok for producing smoke, but the biggest problem you'll have is that the muffler it comes with cannot retain heat once the smoke fluid hits the muffler.

That will lead you to try various mechanisms to keep it hot.... including wrapping it in different materials, etc. ( On my OS Surpass III 1.20 FS I put coils inside an oversized muffler which worked well... ).