DUX Paint Slow Set - Gilding Size - 1 pint is oil-based to provide a long open time for gilding interior and exterior projects. Proper tack will develop in approximately 10-12 hours and will remain open for gilding for about 12 hours. As suggested on the label, a small amount of castor oil may be added to increase the open time for gilding. Projects gilded with Slow-Set Size may be sealed with a clear coat 24 hours after gilding. use on all interior gilding projects. Proper tack will develop in approximately 15 minutes and will remain open for gilding up to 36 hours.