Loctite points to acrylic latex for interior trim. Outside, GE points to silicone or a paintable hybrid and Loctite to siliconized latex, and Pella and GE say not to block the weep holes.
DAP ALEX PLUS (latex caulk): water ready in 24 hours, paintable in 30 minutes, latex or oil.
DAP 100% Silicone Window, Door & Siding (100% silicone): water ready in 12 hours, not paintable, rated for ±25% movement.
Red Devil PU-970 (polyurethane sealant): no water-ready time given, full cure in 24 to 48 hours with a 3/16 inch bead, paintability 2 hours on its data sheet, which also says to paint with premium latex once fully cured. Its data sheet says ASTM C920 Class 35 and Red Devil’s catalog Class 25 for the white. Its SDS carries a Danger warning; Red Devil says to wear gloves.
Sashco Lexel (rubber-based sealant): Sashco calls it instantly waterproof, paintable in 1 to 2 days with water-based paint, rated for ±50% movement.
DAP DYNAFLEX ULTRA (latex caulk): rain ready in 1 hour (white and colors), paintable in 1 hour, rated for ±35% movement. The clear is rated ±25%.
GE Supreme Silicone Window & Door (100% silicone): water ready in 30 minutes under GE’s conditions, otherwise 8 hours, not paintable, rated for ±50% movement.
9 more products list it.
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Inside or outside
Inside: Loctite says acrylic latex is best suited to interior jobs such as window trim, and it takes paint.
Outside: GE says interior paintable products don’t always hold up outdoors, and points to a 100% silicone such as its Supreme Silicone Window & Door, or Pro Seal Max Window & Door if you’ll paint. Loctite calls siliconized latex a good choice for exterior window caulking.
Old caulk: GE says to remove all of it, then wipe the frame with isopropyl alcohol.
Leave the weep holes open
Weep holes let a window frame drain. GE says they’re usually along the bottom, mostly on metal and vinyl windows, and shouldn’t be blocked; find them before you start. Pella’s installation booklet says the same, and describes its exterior bead: backer rod 3/8 inch deep, a continuous bead around the frame, tooled to an hourglass shape.
On Andersen’s site, a contractor’s guest post goes further: seal the top and sides of the flange, but not the bottom, so water can drain out.
The products come from each maker’s own page or data sheet, the inside and outside advice from GE’s and Loctite’s guides, and the weep-hole rules from Pella’s installation booklet and GE. Checked against published data from DAP, GE Sealants, Red Devil, Sashco and Sika (plus 3 more).
See all 21 sources
DAP, ALEX PLUS All-Purpose Caulk: product page, FAQ, technical data sheet (2025) and SDS
DAP, ALEX FAST DRY Acrylic Latex Caulk Plus Silicone: product page, FAQ, technical data sheet (2025) and SDS
DAP, DYNAFLEX ULTRA Advanced Exterior Sealant: product page, FAQ, technical data sheets and SDS
DAP, DYNAFLEX 230 Premium Elastomeric Sealant: product page, FAQ, technical data sheet and SDS
DAP, 100% Silicone Rubber Window, Door & Siding Sealant: product page, technical data sheet and SDS (2026)
DAP, ALEX Painter’s Acrylic Latex Caulk: product page, FAQ, technical data sheet and SDS
GE Sealants, Advanced Siliconized Acrylic Window & Door Sealant: product page, technical data sheet (2024) and SDS
GE Sealants, Painter’s Pro Siliconized Acrylic Seal & Paint: product page, technical data sheet (2024) and SDS
GE Sealants, Advanced Silicone 2 Window & Door Sealant: product page, technical data sheet (2025) and SDS
GE Sealants, Supreme Silicone Window & Door Sealant: product page, technical data sheet (2025) and SDS
Red Devil, 100% Silicone Sealant: technical data sheet and SDS (2023)
Red Devil, PU-970 Polyurethane Sealants: technical data sheet, SDS and 2026 product catalog
Sashco, Big Stretch: product page, technical data sheet and SDS (2024)
Sashco, Lexel: product page, technical data sheet and SDS (2024)
Sika USA, Sikaflex + Construction Sealant: product page and product data sheet (2026)
GE Sealants, “Everything you need to know about window weep holes before sealing your windows” (how-to, 2024, updated 2026)
Pella, Nail Fin window installation instructions (Nail-Fin booklet, revised 2026)
Andersen ProViews, “The consequences of a failed window installation” (guest post by Tyler Grace)