---
title: "Step 2: SP1 Primer Application"
url: https://stacklist.com/card/83f98dac-327d-46fd-a507-355fdc714665
stack: https://stacklist.com/c/business/stack/2d67154e-83fe-4367-99db-e7e4088ce2f9
summary: "SP1 Primer Application is the critical adhesion foundation for FM ELEVATION membrane assembly, requiring proper substrate preparation, temperature control, and coverage rates to prevent bubbles and edge lifts. The process includes pre-application verification, roller or brush application at specified rates, flash-off monitoring, and comprehensive documentation with a sign-off checklist."
tags: "primer-application, sp1, membrane-installation, adhesion, construction-checklist, quality-control, fm-elevation"
key_entities: "SP1 Primer (technology), S60 membrane (technology), FM ELEVATION (technology), tack-free state (concept), thermal off-gassing (concept), flash-off (concept)"
classification: "checklist"
content_hash: "sha256:e7304efe2b03f9f7d8ccbc9aeb2ca53532ce4196536ac79e68c481a34923ceb4"
acp_version: "0.2"
token_counts_approximate: 510
visibility: public
agent_accessible: true
status: "final"
---

# Step 2: SP1 Primer Application

Step 2: SP1 Primer Application 
Overview 
SP1 Primer is the adhesion foundation for the entire FM ELEVATION assembly. Correct application
ensures the S60 membrane bonds fully and uniformly. Poor primer coverage is the leading cause of
membrane bubbles and edge lifts. 
Pre-Application Checklist 
[ ] Substrate passed Step 1 sign-off 
[ ] Ambient temperature: 40F minimum, 100F maximum 
[ ] Surface temperature: Same range. Do not apply on a surface that is hotter than the ambient air
(thermal off-gassing will cause bubbles) 
[ ] No rain forecast within 4 hours 
[ ] Surface is dry to the touch. No dew, frost, or standing water 
Application Method 
1. Stir SP1 thoroughly before use. Do not thin. 
2. Apply by roller (3/8 in. nap) or brush. Spray application requires manufacturer approval. 
3. Coverage rate: Apply at the rate specified on the SP1 TDS (typically 200-300 sq ft per gallon on
concrete; less on porous or rough surfaces). Do not over-apply. Thick primer films pool and create a
weak bond layer. 
4. Work in manageable sections. Keep a wet edge. 
5. Apply primer up all vertical transitions and curbs to the height the membrane will terminate. 
Flash-Off 
Allow SP1 to reach tack-free state before applying membrane. This is typically 30-60 minutes at 70F
and low humidity. 
Test: Touch lightly with a clean finger. Primer should feel tacky but not transfer to your finger. 
Do not apply membrane over wet primer. Do not let primer fully cure to a hard film (maximum
open time per TDS). 
8/8/26, 12:45 AM Step 2: SP1 Primer Application 
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Common Mistakes 
Applying over damp or dirty substrate 
Applying below 40F (primer will not cure properly) 
Rolling too fast and leaving skip marks (thin spots) 
Not priming up the vertical curb faces 
Documentation Log 
Item Value 
Date applied 
Ambient temp 
Surface temp 
Relative humidity 
Coverage rate (sq ft/gal) 
Flash-off time 
Applicator name 
Supervisor sign-off 
8/8/26, 12:45 AM Step 2: SP1 Primer Application 
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