Question about latex painting plywood

[southernfryedyankee]

I have an idea for my boat and I want to know what the best way to go about putting my plan into action would be. As you can see there are 2 pieces of carpeted wood to the left and right of my Daughter. This is press board wood covered by carpet and it seems to be deteriorating. If I use a good 1/2-3/4" plywood could I seal it using quality marine grade latex paint? I will obviously have to add holes for my transducer wire and my boat light but I would imagine a good coat or 2 of latex paint would seal the edges and the wood itself correct? I plan to remove the old planks and run a U shaped piece of wood covering the back also as to where I could addd some cup holders, another set or 2 of rod holders and some HDPE cutting boards. What problems would arise from me doing this? I do not plan on taking this boat out in the rain although I do understand rain can hit at anytime but it will not be a practice for me. By the paint program pic I would hope you can see how I wish to utilize the layout towards the back of my boat, with a cut out to fit my motor. I will also have 2 small support beams for the back of the transom part of the new wood layout.

 

[acabtp]

no, latex paint will not seal the plywood and protect it from water. if you want to do that, use epoxy resin, or at very least some spar urethane.

 

[onthewater102]

Latex paint is water based

 

[satx78247]

IF I was doing this project, I would use MDO painted with "Porch & Deck" paint & expect it to last longer than I will. - MDO is considerably cheaper than marine ply.
(I like CHEAP.)

MDO lasts for DECADES, when used for highway signs & with only oil-based paint.

yours, satx

 

[Andy Taylor]

satx78247 » Tue Jul 29, 2014 3:09 pm[/url]"]IF I was doing this project, I would use MDO painted with "Porch & Deck" paint & expect it to last longer than I will. - MDO is considerably cheaper than marine ply.
(I like CHEAP.)

MDO lasts for DECADES, when used for highway signs & with only oil-based paint.

yours, satx

That's what I used for my floor and it's holding up great. This is the 4th season. I used 1/2" MDO, primed it with Kilz 2 primer, then 2 coats of "Dutch Boy" Floor and Porch paint. I primed and painted the bottom also, and all 4 edges. I also used a non-slip additive in the paint. All this I bought at Menards.

 

[satx78247]

Andy Taylor; All,

Btw, T-111 (with or W/O grooves) works about as well as MDO, when painted & it's often even less expensive.

yours, satx

 

[Johnny]

as a retired sign maker, I would strongly suggest the MDO (medium density overlay).
will last for years. The only "must do" is to round over the edges a bit with block sanding.
Force oil based primer (Kilz) into the endgrains and paint with your favorite top paints.
I use Benjamin Moore or Valspar 25 year latex paint.
Look at your local wood signs - - - you can tell which ones were thrown up and which ones
took their time in preparation.
hard enamel will crack and peel, latex will expand and contract with temperature and humidity.

some box stores carry it. maybe stop by your local sign shop to see if he has any old signs
he would sell you (or free).

jus my dos centavos

 

[satx78247]

Barefoot_Johnny,

Our "county barn" (up in NE TX where I'm originally from) gave me several perfectly suitable "obsolete" signs made of MDO, that I recycled into wooden boat (building simple homebrew boats is one of my "things".) parts.
(Usually, IF a piece off an edge gets cracked/chipped, the whole panel gets "scrapped".)

Btw, I'm "gathering up pieces" to build a replica of the SHARPSHOOTER, designed by Phillip C. Bolger in 1956. = SHARPSHOOTER was (or is - Is she still extant???) a 22.5x5.5 foot open utility square-stern dory made of 1/2" marine plywood & "armored" with Kevlar cloth & epoxy, to comfortably "fish 3 adults".
(My replica will be steered with an "old school" side-mounted, stick-steering rig & powered with a 1957 Johnson Golden Javelin (RDE-19). - That long/slim/flat-bottom bay-fishing skiff will SCOOT with only 35HP. - The original would run 11.25MPH with a 1955 10HP Evinrude and 25MPH with 2 men (a load of 550#) aboard & an old/tired 25HP Johnnyrude.)

yours, satx