For hairline cracks, cut a small bead & smooth it out with your finger after? We have an older house with plaster walls/ceilings with hairline cracks?

Thank you for posting your inquiry on DAP Elastopatch Smooth (or Textured) Flexible Patching Compound. As indicated on the product package label and supporting product literature: “Clean surface removing all loose particles, plaster, wax, dust, dirt, peeling paint, old caulk, grease and oil. Using a brush, putty knife or trowel and fill crack with patching compound. If using the cartridge, cut nozzle to desired bead size, load into caulking gun and apply to surface. Tool patched surface to desired finish before product dries. PRODUCT IS NOT SANDABLE. For some repairs, more than one application may be required. Use product to bridge gaps up to 1/4” wide and 1/2” deep. Fill small cracks and surface defects to a minimum depth of 1/8”.” Should you have any additional questions or require further assistance, please feel free to contact DAP’s Technical Customer Service Department at 888-327-8477.