Which Adtech (now Sika) filler should I use—P-11 (AP112), P-14, P-17, or P-77?

Adtech (Sika) Marine Fillers: How to Choose — P-14, P-11/AP112, P-17, P-77/AP077

Quick pick: For most boat fairing and everyday bonding, choose P-14 Ultra Filler (our top seller). Use P-11/AP112 when you want a reinforced, fiber-filled bond & fill. Choose P-17 for high-heat environments. Go with P-77/AP077 if you want a styrene-free, easy-sanding filler that still tolerates high service temps.

P-14 Ultra Filler (Top Seller)

Best for: Everyday marine fairing & bonding, fast shop work, clean sanding.
What it is: Smooth, thixotropic, set-fast filler; bonds to fiberglass, SMC/RIM/BMC, metals & more, with “no bleed out.” :contentReference[oaicite:12]{index=12}
Mix ratio: 100 parts paste : 2 parts BPO cream hardener. :contentReference[oaicite:13]{index=13}
Work life / finish: ~5 ±1 min work life; sand/finish in ~15 min. :contentReference[oaicite:14]{index=14}
Hardness / heat: ~Shore D 86; heat resistance ~350°F (177°C). :contentReference[oaicite:15]{index=15} :contentReference[oaicite:16]{index=16}

Shop P-14 Ultra Filler

P-11 (SikaBiresin AP112) — Fiber-Filled Bond & Fill

Best for: Reinforced bonding & rebuilding voids; deeper composite repairs before final fairing. :contentReference[oaicite:17]{index=17}
What it is: Polyester FRP bond & fill system, thixotropic, fiber-filled; excellent adhesion, low moisture absorption; minimal shrink. :contentReference[oaicite:18]{index=18} :contentReference[oaicite:19]{index=19}
Mix ratio: 100 parts AP112 : 2 parts BPO (by weight). :contentReference[oaicite:20]{index=20}
Pot life: Green system ~4–6 min; White system ~8–10 min (102 g @25°C). :contentReference[oaicite:21]{index=21}

Shop P-11 / SikaBiresin AP112

P-17 — High-Heat Filler

Best for: Areas exposed to elevated temperatures; aerospace/automotive/tooling where up to ~446°F (230°C) may occur. :contentReference[oaicite:22]{index=22}
Mix ratio: 100 parts paste : 2 parts BPO. :contentReference[oaicite:23]{index=23}
Work life / finish: ~5–7 min work life; finish in ~15 min. :contentReference[oaicite:24]{index=24}
Notes: Sands/grinds to feather edge; accepts virtually all coatings when finished. :contentReference[oaicite:25]{index=25}

Shop P-17 High-Heat Filler

P-77 (SikaBiresin AP077) — Styrene-Free, Easy-Sanding

Best for: Styrene-free applications that still need quick set and high service temperature (up to 392°F / 200°C). :contentReference[oaicite:26]{index=26} :contentReference[oaicite:27]{index=27}
Mix ratio: 100 parts AP077 : 2 parts BPO (by weight). :contentReference[oaicite:28]{index=28}
Pot life: ~9–11 min (102 g @25°C). :contentReference[oaicite:29]{index=29}
Finish: Easier to sand than conventional fillers; feathers out cleanly. :contentReference[oaicite:30]{index=30}

Shop P-77 / SikaBiresin AP077

General tips

Always prep: clean, roughen, clean again, and dry before applying. :contentReference[oaicite:31]{index=31}
Typical mix path: 100:2 (paste:BPO), ~5–10 minutes to set, then sand/finish. Do not over-catalyze—can cause gumminess. :contentReference[oaicite:32]{index=32} :contentReference[oaicite:33]{index=33}