Can You Substitute Cornstarch For Clear Jel?

Can You Substitute Cornstarch For Clear Jel? Can you substitute cornstarch for Clear Jel? Can you substitute tapioca, flour, or cornstarch for Clear Jel®? No, when canning pie filling, there is no substitute for Clear Jel®. Other thickeners like cornstarch clump when canning and may interfere with heat being able to reach throughout the jar.