Great stuff foam question

currently building a L shaped living wall for my dragon strand out of egg crate and great stuff foam, with eco earth covering the foam. Problem i'm having is when the foam drys it bubbles up like the wall has boils all over it. Anyone here have some suggestions for making it have a flatter but

This ready-to-use, minimal-expansion insulating gap filler expands up to 1 inch to take the shape of gaps, creating a long-lasting, airtight and water-resistant seal around plumbing and electrical, in basements, attics and more. STRAW-APPLIED. Save time on your projects with this simple to use spray foam- the straw applicator makes any project a breeze and helps you deliver the right amount of insulating foam even in hard to reach spaces. SPRAY ANYWHERE.

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