Sunshine room adhesive, in a word: Neutral silicone sealant weather resistant adhesive (non structural adhesive) must be used, which is mainly UV resistant, highly elastic, and non corrosive to metal/glass, with a warranty of 10 years or more. Below, we will explain clearly from five aspects: selection, performance, construction, brand, and pit avoidance.
1、 Why do sunrooms need to use ‘neutral weather resistant silicone adhesive’
Neutral=non corrosive: Acidic adhesive can corrode aluminum, coated glass, and stone. It is strictly prohibited to use acidic adhesive in sunrooms.
Silicone=Weathering King: Maintain elasticity at -50 ℃~150 ℃, resist UV rays for 20 years without cracking, suitable for outdoor exposure.
Weather resistance=waterproof and aging resistant: specifically designed to handle rainwater, temperature differences, and wind pressure, with a displacement capacity of ± 25% (25LM level), capable of absorbing thermal expansion and contraction without cracking.
≠ Structural adhesive: Weather resistant adhesive is responsible for waterproof sealing; Structural adhesive is responsible for load-bearing bonding (such as glass and frames) and cannot be mixed.
2、 Core performance indicators (must see when purchasing)
Type: Single component, neutral ketoxime type (mainstream).
Displacement capability: ≥ 25LM (± 25%, preferred for sunrooms); A large temperature difference in the north requires 25LM.
Temperature resistance: -40 ℃~150 ℃.
Warranty: Outdoor for 10 years+(engineering grade).
Adhesive substrates: glass, aluminum, plastic steel, coated glass (no primer required).
Environmental Protection: Low VOC, odorless, suitable for indoor and outdoor use.
3、 Applicable scenarios (full coverage of sunrooms)
✅ Glass and aluminum/frame joints (top, side)
✅ Glass to glass joint (non load bearing)
✅ Sunroom and wall closure joint
✅ Aluminum plastic panel, skylight, canopy sealing
❌ Cannot perform structural bonding (such as glass lifting, load-bearing fixation)
❌ Long term immersion and underwater scenes
4、 Construction key points (determining waterproof life)
Base treatment: clean, dry, free of oil stains, dust, and frost; Construction is absolutely not allowed on damp surfaces.
Construction temperature: 5 ℃~35 ℃; Suspend below 5 ℃ or above 40 ℃.
Glue seam size: width x depth=1:1~2:1; Commonly used width of 8-12mm and depth of 6-10mm, too deep can easily crack.
Glue application: The glue gun applies glue at a constant speed, full and without bubbles; Vertical seams use a thixotropic type (non flowing).
Edge trimming: Scrape and finish within 10 minutes after applying glue to ensure a neat and compact appearance.
Curing: Surface drying takes about 2-4 hours, complete curing takes 7 days; Avoid rain and pulling for 7 days.
5、 Brand recommendation (engineering grade, warranty of 10 years+)
International first-line: Wacker SN910 (25LM, 15 year weather resistance), Dow Corning 791.
Domestic first-line: Dongfang Yuhong YS-109, Keshun S320, Lingzhi Sunshine Room Special, Daguangming DGM-6068.
Price reference: 300ml/piece, 20-50 yuan (engineering grade); Be cautious when buying below 15 yuan (prone to aging and cracking).
6、 Common misconceptions and pitfalls to avoid
❌ Using acidic glass adhesive: corrodes aluminum/coated glass, and will leak water for 1-2 years.
❌ Using ordinary glass glue: not resistant to UV, may crack within 1-2 years.
❌ Replacing weather resistant adhesive with structural adhesive: high cost, poor elasticity, and easy cracking.
❌ The glue seam is too narrow or too shallow: it is easy to crack due to thermal expansion and contraction.
❌ Wet construction on the base surface: delamination, foaming, and water leakage.
