Thoroseal to seal my pond, many cracks after draining?
Hi, my contractor is drying to restore our 100 gallon concrete block fountain/pond and is failing.
First, he sealed it with thoroseal only(no acryl60). It dried...and I noticed many spider cracks on the vertical surfaces only. The cracks were hairline
second, he recoated thoroseal only...this time wetting the surface first. it dried, no more cracks!
4-5 days later, I filled with water upon finding no cracks...seemed to hold fine, but i drained it 4-5 later to clean it out.
upon draining it, I noticed tons of hairline cracks again.
any ideas?? Is it because they are not using Acryl 60? or are they mixing the stuff wrong. maybe not letting the thoroseal stiffen up 30 minutes before applying?
I'm confused...I'm sure the workers are not reading the instructions...