Just read it through again. . . . I noticed some people recommended "silastic / silicone" . . . . They do not dry hard enough and cannot be sanded or painted. Sikaflex / Liquid Urathene dries hard but flexible. It is sanable and paintable. It does not contain any acids. If anyone has had no luck with it . . . it was because they did not prep properly. This is the only way you can fail with sikaflex / Urathene. DO NOT . . i repeat . . DO NOT . . . use silicone or silastic. Peace