If you can’t afford to buy modeling mediums for filling gaps, the next best thing is baking soda and super glue. Primitive but effective. Place the baking soda into the gap, the squeeze enough super glue from one end of your gap…then watch the capillary affect take place. Sand down as required. Repeat if the gap takes more filling. Using this process however requires the use of primer when you get ready to paint so the super glue does not bleed through your finish. Use mom’s emory board for her fingernails to sand it down. Household products are all around you…just have to see them.
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