 Re: Puff additive to avoid bleed?
If you are printing on 100% cotton bleeding (dye migration) shouldn't be a problem. In this case, puff can help you because it will make the print appear a bit more opaque. Try adding 5%.
If you are printing on poly or cotton/poly blends you have to contend with dye migration, especially on dark garments. Although the puff helps opacity a little, I don't think it'd keep bleeding down, better off controlling bleed by using the right inks and/or dryer settings. You can try adding low-cure additive to the ink to allow the prints to cure with less heat. Also cool them off as fast as you can after cure, use a fan if possible. Don't let them fall in a box or stack them right up because the heat is what causes the dye migration.
I used to work for a shop that would add 10% pclear and 2% puff (to maintain opacity) to their mixes as a cost effective way to extend ink volume, but they still used low-bleed inks (qcm's perm series) on poly garments. | 
