Transom sealant shrinking on my 41DS

[PlainSight]

The sealant between the hull and deck on my 41DS transom seems to be shrinking and needs some attention, does anyone know what kind of sealant the factory typically uses? and should I remove all the old sealant, or can I apply the new stuff over it? Any advice on the best way to handle this would be much appreciated

 

[Key04]

Factory sealants can vary actaully, but most likely its a polyurethane like 3M 5200 or a polysulfide like Sikaflex. Just check with the manufacturer to be sure. Though either way, it's best to remove the old sealant completely to ensure proper adhesion and a watertight bond, applying new over old usually lead to poorer results

 

[Almar1]

Most factories use marine-grade polyurethane or polysulfide sealant for hull-deck joints, it's best to remove all old sealant before applying new for proper adhesion and lasting seal

 

[PlainSight]

Factory sealants can vary actaully, but most likely its a polyurethane like 3M 5200 or a polysulfide like Sikaflex. Just check with the manufacturer to be sure. Though either way, it's best to remove the old sealant completely to ensure proper adhesion and a watertight bond, applying new over old usually lead to poorer results

Removing all old sealant sounds like the right move, uhm but any tips on the best way to remove it safely?

 

[PlainSight]

Most factories use marine-grade polyurethane or polysulfide sealant for hull-deck joints, it's best to remove all old sealant before applying new for proper adhesion and lasting seal

Got it, thanks! do you recommend any specific tools or techniques for removing old sealant without damaging the hull or deck surfaces?

 

[SidOnTheSea]

Hey, just chiming in!
To thoroughly remove old sealant, try scoring the edges with a sharp utility knife, avoiding the surface!
Use plastic sealant removal tools or scrapers for bulk removal to prevent gelcoat gouging.
For residue, apply marine adhesive removers like DeBond or Re-Mov, then let them soak to soften the material.
Make sure to scrape gently and swipe with acetone or denatured alcohol for final cleaning.
For silicones, meticulous mechanical removal is usually best, followed by solvent wipes.
A light sanding with fine-grit paper (220-320) can aid new sealant adhesion, but be careful not to remove too much gelcoat!

 

[SunOdysseyGuy]

Solid advice. Scoring and light scraping can really help keep things from getting messed up. I also like the idea of using marine removers and taking care with sanding to prep the surface. What kind of sealant are you working with?