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API-936 Exam - Topic 1 Question 21 Discussion

[Installation Procedures]Which of the following statements regarding curing of hydraulic bonded castables is true?
D) No part of the lining shall be allowed to air dry more than 3 hours before application of a curing compound
A) Apply a manufacturer approved membrane-type curing compound before the surface is dry to the touch
B) The membrane curing compound shall burn off at a temperature not less than 500F (260C)
C) After remaining in place for 24 hours, forms shall be removed and a curing compound applied within 1 hour of form removal

API-936 Exam - Topic 1 Question 21 Discussion

Actual exam question for API's API-936 exam
Question #: 21
Topic #: 1
[All API-936 Questions]

[Installation Procedures]

Which of the following statements regarding curing of hydraulic bonded castables is true?

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Suggested Answer: D

by Elza at Jun 19, 2026, 02:55 AM

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Marnie
I lean towards C. Timing after form removal is key for proper curing.
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Shawnta
5 days ago
I feel like D is crucial. Air drying too long can ruin the lining.
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Nan
10 days ago
I think option A is correct. It makes sense to apply it before it dries.
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Golda
15 days ago
C) sounds right, timing is key after form removal.
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Shelton
21 days ago
Wait, 3 hours max for air drying? That sounds too short!
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Alex
26 days ago
B) is correct, 500F is the standard for burn-off.
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Lashawnda
1 month ago
I disagree with D, 3 hours seems too strict.
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Hillary
1 month ago
A) is definitely true, gotta apply that compound before it dries!
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Gerry
1 month ago
I’m a bit confused about option C. I know forms should be removed after a certain time, but I can’t remember the exact timing for applying the curing compound.
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Margery
2 months ago
I feel like we practiced a question similar to this one, and I think option D was emphasized as important to prevent air drying. That might be the right answer.
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Marg
2 months ago
I remember something about curing compounds needing to withstand high temperatures, so option B might be correct. But I’m not completely confident.
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Lyda
2 months ago
I think option A sounds familiar, but I’m not entirely sure if it’s the right choice. We talked about curing compounds in class, but I can’t recall the specifics.
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