Acrylic Caulk Curing

Log Out | Topics | Search Moderators | Register | Edit Profile

Author Message (Unregistered Guest) Unregistered guest Posted on Friday, March 24, 2006 - 10:58 am:    My foamed roof had cracks. I cut them out and filled the gaps with acrylic caulk recommended. That caulk is filling gaps as deep as 1 1/2" deep and as much as 2" wide. After several days, there's only a thin skin formed over the still soft caulk. Should I put the two-stage roof coatings over the soft caulk? I believe it's a water-based material that needs air and sunlight to cure. If I coat it, it will never cure. I plan to apply membrane along with coatings. Shall I do that now? All comments appreciated! Doug Brinley AIA CSI CDT CCS Senior Member Username: dbrinley Post Number: 187 Registered: 12-2002 Posted on Friday, March 24, 2006 - 11:57 am:    [When you say cure, you could mean 'dry out'. Of course there is a difference between drying out and 'curing' sufficiently to release the volatiles that were necessary to begin the chemical reaction to set the sealant material.] On the dimensions of the cracks, please confirm that you have cracks that are either 1-1/2" deep or 2" wide, but not both at the same time. I think the 2" width crack is a problem, but the 1-1/2" cracks are nothing terribly unusual. There are many variables on a foam roof application (location, weather, why the foam cracked in the first place, etc) that to give you a response here would be irresponsible. However, sealant does not generally have to 'cure' completely before recoating a roof - in many cases. It depends on the condition of the existing roof coating, the chemical and physical nature of the sealant, the completion of the reaction for the sealant cure, and the chemical and physical nature of the added roof coating. Doug Brinley AIA CSI CDT CCS Senior Member Username: dbrinley Post Number: 188 Registered: 12-2002 Posted on Friday, March 24, 2006 - 11:58 am:    What is 'two-stage'? Please explain. What is the 'water-based material' you are referring to - the sealant or the new roof coating?