Renew is a unique thinner specifically designed resolve thickening of complex toluene, formaldehyde and DBP FREE formulations of nail polishes, top coats and base coats. As polishes are opened and closed, vital solvents evaporate causing thickening and reduction of product efficacy. Now there’s no need to throw away thickened polishes, top coats or base coats. Let Zoya Renew make them just like NEW again. Zoya Renew is better than traditional thinners, because traditional thinners were designed for outdated polish formulas that were loaded with toluene, formaldehyde and DBP. If you use a traditional thinner to thin out your polish, you may actually be destroying your polish. Using Zoya Renew saves your polish! Zoya Renew saves you money by making your polishes, base coats and top coats last up to 50% longer.