Old 03-10-2014, 11:41 PM
kbartman's Avatar
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Default Re: 42" Pompeii in S. Louisiana

Originally Posted by Kurtloup View Post
Thanks for the tips. Maybe I will apply another coat of stucco to see if it will get any smoother. One problem I had was getting the stucco to adhere to the previous layer. If I worked it too much, it would fall off.

I had the same issue with the stucco falling off........... I'm no stucco man I can only give my thoughts on what I learned with my stucco process. I did not stucco my dome, I only rendered a thin layer of left over mortar on my dome to add some thermal mass. After the mortar set up a little, I rubber floated the surface knocking down small high spots. It turned out ok. .......... I had a lot of corners and angle on my chimney and enclosure I wanted to keep square and true. It was a uphill battle but I think I won...........I hope it don't fall off in a year or two........I found as I started the stucco process on the enclosure it was very difficult to trowel high spot down. I was shooting for a 3/8 " layers and ended up 1/4" to 1". As I trowel the high spots, the stucco would begin to pull and fall away. I thought that over troweling was causing my stucco to fall off. After some deep thought and plenty of failures (I had plenty of time for thought, as my stucco job took forever), I think I was moving the stucco that was trying to adhering to the undercoat. Which was causing either air or water to build against the under coat and the stucco would fall away (I've seen both wet and dry failures). I change my technique, If I had a high spot I would not use more pressure on the trowel or float to try to move the excess stucco to the low spot. I would use the edge of the trowel or float to screed away the excess stucco. After I applied that theory I had no failures.........Hope and believe my theory is correct, seemed to work for me.
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Last edited by kbartman; 03-11-2014 at 09:11 AM. Reason: revised explanation
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