Description
The Sika AP112 repair filler is Part A of a two-component polyester bond and fill system built for repairing SMC, RIM, and other thermoset composite parts. Supplied as a green, fiber-filled paste, it pairs with BPO cream hardener to cure into a hard, sandable patch that restores broken or void areas on molded composite components.
Where the Sika AP112 repair filler gets used
Composite fabricators and automotive body shops reach for this system when a molded SMC or RIM part has a crack, void, or broken flange that needs structural rebuilding rather than a cosmetic skim coat. The fiber fill gives the cured patch enough mechanical integrity to hold up under the same stresses as the surrounding molded material, which matters on load-bearing composite panels and structural body components. It also works on general thermoset composite repair outside the automotive world wherever a shop needs to rebuild a void without replacing the whole part.
Because the Sika AP112 repair filler is a paste rather than a liquid resin, it stays in place on vertical and overhead repair areas during cure instead of running or sagging off the work surface.
How the Sika AP112 repair filler holds up
Cured hardness reaches Shore D 83, in line with the surrounding SMC and RIM substrates it is designed to match. Pot life runs 4 to 6 minutes for the green resin side and 8 to 10 minutes once combined with the white BPO cream hardener, so mixed batches should be sized to the repair at hand rather than mixed in bulk. Maximum service temperature is rated to 130°F, suitable for interior and underbody automotive applications as well as general shop-floor composite repair.
| Property | Value |
|---|---|
| Technology | Polyester resin plus BPO hardener |
| Component | Part A (resin) |
| Mixed color | Green (Part A), white (hardener) |
| Shore D hardness | 83 |
| Pot life | 4 to 6 min (Part A), 8 to 10 min (mixed) |
| Max service temperature | 130°F |
| Substrates | SMC, RIM, other thermoset composites |
Order Part A alongside the matching BPO cream hardener to complete the system. For related epoxy and bonding compounds, browse Chemical Concepts other adhesives. Sika documents mix ratios and cure schedules for the AP112 system on its tooling and composites product guide at Sika.
Need Help?
Need help sizing a mixed batch to your repair area? Call (800) 220-1966 or email [email protected].
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