Questions: Bottom paint prep work for trailer boat - Page 2 - SailNet Community

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Go Back   SailNet Community > On Board > Gear & Maintenance
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  #11  
Old 03-12-2008
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Quote:
Originally Posted by Sailormon6 View Post
Catalina started barrier coating their boats at the factory in about 1989, so your boat probably has a barrier coat on it to protect it from blisters. If you sand off too much, you'll lose that protection. I'd sand it the bare minimum necessary to scuff the bottom so that the paint will adhere.
With my luck I'm sure I've sanded through it already....

Mike
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  #12  
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Quote:
Originally Posted by chucklesR View Post
PS. some of that doesn't look like bare fiberglass to me.


Help me with this. What does it look like if it's not?


Mike
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Old 03-12-2008
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I've finished all of the sanding except for a small area under the bow roller. But that will be easy to take off and do. Now just waiting for my paint to come in. I used concrete blocks with two 2x8s on top along with a towel for cushioning. I thought I would have to do the bow also, but as I lifted the stern, the boat came up enough off the bunks for me to sand underneath the entire length of the bunk area. I guess this was because the bow was resting on the bow roller. I placed jack stands under the front part of the trailer to take some of the pressure off the trailer jack. I used sandpaper attached to a piece of wood to sand under the bunks as I was not comfortable sticking my whole hand between the bunk and the boat. For the small area under the keel I used a piece of sandpaper attached to a long stick so I would not have to get under the trailer while it was being supported as it was. I don't mind getting under it while the boat rests on the trailer but I was not about to while it was on those concrete blocks. I am linking some more pictures from my flickr site. Any suggestions or constructive criticisms? Please send them my way.....

Mike

Note: I was not finished sanding when I took these pics so the hull still looks shiny where the bunks were. But they are nice and matte looking now...

http://farm4.static.flickr.com/3267/...1e3406dc_b.jpg
http://farm3.static.flickr.com/2350/...ddd461f1_b.jpg
http://farm4.static.flickr.com/3044/...1738ca50_b.jpg
http://farm3.static.flickr.com/2027/...b0b18bdf_b.jpg
http://farm3.static.flickr.com/2352/...8ba623e8_b.jpg
http://farm3.static.flickr.com/2370/...0ba24929_b.jpg
http://farm3.static.flickr.com/2183/...7f1eb5ac_b.jpg
http://farm4.static.flickr.com/3266/...43b1d54f_b.jpg
http://farm4.static.flickr.com/3271/...3859b6a2_b.jpg
http://farm4.static.flickr.com/3224/...08a46f70_b.jpg

Last edited by venturousviking; 03-12-2008 at 06:56 PM.
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  #14  
Old 03-12-2008
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this one still has enough shine to reflect the towel. It's your call because sometimes pictures don't cut it:
http://farm3.static.flickr.com/2370/...0ba24929_b.jpg

My earlier comment was based on what I now see be reflected bunker boards (the black looked like previous paint).

Seriously, it's all fine. Paint it, launch it, pull it in 6-8 weeks and take a look. If you can take a snorkel here and there and scrub the bottom.
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Old 03-12-2008
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That hull looks awfully shiny for something prepped for new paint... One way to tell if the hull is really clean is to spray it with water... if the water beads up or sheets anywhere, then you've got some more cleaning to do.
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Quote:
Originally Posted by chucklesR View Post
this one still has enough shine to reflect the towel. It's your call because sometimes pictures don't cut it:
http://farm3.static.flickr.com/2370/...0ba24929_b.jpg

My earlier comment was based on what I now see be reflected bunker boards (the black looked like previous paint).

Seriously, it's all fine. Paint it, launch it, pull it in 6-8 weeks and take a look. If you can take a snorkel here and there and scrub the bottom.


Yeah I guess I should clarify. I was not finished when I took those pictures. That was right after I lifted the boat off the bunks...I assure you that it looks like a matte finish where you see shine. But thanks for noticing. That's why I post the pictures to see if any of you more experience sailors could give me some advice......
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Quote:
Originally Posted by venturousviking View Post
Help me with this. What does it look like if it's not?

Mike
It looks like Interlux 2000 barrier coat. It should be fairly thick, and it's fairly tough. If you haven't sanded through it, it's probably OK. Just check the hull for blisters whenever you haul the boat.
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Old 03-13-2008
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I sure hate to see anyone trust their or their boats safety to concrete blocks.
They can crack and split and you could end up with a lot bigger problem than you started with.Timbers of some kind(railroad ties?) would be a lot safer.
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Old 03-13-2008
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The concrete blocks are not the blocking to be using. Especially since they are stacked the wrong way! The holes in the blocks should be vertical and not horizontal! The strenght of the concrete block in in the direction of the holes. Please, be very careful since there are only three parallel webs supporting the weight.
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Quote:
Originally Posted by mykengel View Post
I sure hate to see anyone trust their or their boats safety to concrete blocks.
They can crack and split and you could end up with a lot bigger problem than you started with.Timbers of some kind(railroad ties?) would be a lot safer.
Quote:
Originally Posted by pfatyol View Post
The concrete blocks are not the blocking to be using. Especially since they are stacked the wrong way! The holes in the blocks should be vertical and not horizontal! The strenght of the concrete block in in the direction of the holes. Please, be very careful since there are only three parallel webs supporting the weight.
Yeah I went against my better judgment when I bought the blocks but I am anxious to get my boat in the water and I could not think of anything else that would be strong enough to do the job. This winter I am going to invest in some boat jacks. Thanks for the advice on turning them the other way. I got my paint in today and I will stack them differently when I paint the bottom this Sunday.....


Mike
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