Last fall I was trying to figure out why I had paint cracking on the aft deck of my Maser. The aft deck seemed very soft. Three mm. plywood is flexible but this seemed worse than usual. The only way I was going to find out was to cut two holes in the aft deck. It turned out that there was a mini-frame, about 50 mm. deep, of 3 mm. plywood, set aft about 300 mm. from the main aft bulkhead. It had cracked on both sides about 150 mm. in from gunwhales, probably when I had moved aft on that area on a heavy-air reach.
To make the frame whole again, I sistered the frame at both the cracks.
The following photos show the process of working backwards to get a watertight aft deck once the repairs had been made.
Backing pieces glued on. Plywood top piece cut to fit. I used a top piece of pine as a gluer for the plywood top piece on the aft side. This also gave some added I-beam strength above the mini-frame. (I cut the hole right next to the mini-frame repair and didnt have room for an aft backer strip.)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiHpFbZ0gMJfvy4QKhQtuxQIYYIrLe_ZL1fuKkxAkpgCpSMRnKegNF-332toPM3HGzFsxlN-YxvLGppgku4rM_BQzb7Fk8GejcAHPmD5nTgmrAqvpOnxeNrV4G9zB1nnJvHsMWM5gei_oCp/s640/HoleOpen1.jpg)
Close up of the open hole with backers in place.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEin-EbQJaSkko_JcjJJruDOmtJhAwlvrmd_K5f2tn7xyE_5HYuyuBYWNPf09XeRY238Wytq_yx0NVqGb24UMN_zFnc0_9ALGwGAFVsACBk4-3_RjUhBMTRv4GnKvYZuo-fEL6CJ-0lMeAM8/s640/HoleOpen2.jpg)
Both plywood pieces in place, glued up. Top aft I-beam pine piece glued down.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEisjLTYwWv-C5R7tPNjSeUR20A75AeBmZVkqKJ94mIC6RJsKaeBZ2RB5YtZg3kyuxEzWQkVHOZCL0KmBNGJx_QOrd2jjgcjO_GJmyqvJO5mqNcavnX9fnEWwB1VubfxX0f5VM49UmS_ulZC/s640/HoleClosedUp3.jpg)
Repairs glassed over with 9 oz biaxial cloth.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjWdsftijpg-KDvrNBi9kPsO0qfFgy60SgwBUZhuIS0lzq-1UqiGqOdN_JGrSpmwwlPOzed8qLMz4O7gzYUVv5zRquZ9oOduGvDGepqmL5nebcEQqU6cqMNE2NyESYSs3mdKTBUify0nFCd/s640/HolesGlassed2.jpg)
I was eventually able to get some primer down and that is how she looks at the present time. Good enough for a Tweezerman repair.
Click here for the original Maser post.
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