Sealing a Hull Before Paint
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Sealing a Hull Before Paint

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    Member sideways_s13's Avatar
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    Default Sealing a Hull Before Paint

    I'm in the process of getting my 73 Hondo jet ready for paint. I have the major repairs complete and everything fairly straight. I'm getting close to spraying primer. I will be using duratec. One question I have is after I spray the primer and block everything straight do I need to spray something to seal the primer to create a waterproof barrier? I could be wrong but polyester primer will absorb moisture correct? I want to spray black gel coat on the bottom of the boat to help with abrasion resistance. If I'm going to spray gel on the bottom should I go ahead and spray the entire hull with gel basically to "seal" the hull?? I want to use regular automotive paint on the rest of the boat to give more design possibilities. I may be over thinking this. What I'm worried about is the paint below the water line. If the paint below the waterline would get scratched or chipped and water is able to get to the primer underneath wont this cause an issue? I know that if I could skip gel coating the entire boat and be ok that would save a lot of work. This will be my first complete paint job. I'm confident in my skills. I just need a few pointers to get started. I've spent days reading practically every thread on this site and I have learned a lot. Its great to have access to such a large amount of knowledge in one place. Here are a few pictures of my project. Thank you for your help
    '73 Hondo Jet, 5.3LS, Borg Warner S475 "MACHINIST MAKE THE WORLD GO ROUND"

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    I use ppg epoxy sealer like dp50lf

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    [QUOTE=sideways_s13;3677161] I'm getting close to spraying primer. I will be using duratec. One question I have is after I spray the primer and block everything straight do I need to spray something to seal the primer to create a waterproof barrier? [ QUOTE ] The answer to that question is no .......above or below the waterline .

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    Express Composites: Fiberglass, Resin, Epoxy, Carbon Fiber, Kevlar, mekp, etc. Quick note these people offer the best prices even after shipping and might I recommend using the ( Duratec ) white primer 714-002 and have we not talked about this earlier thru , E - Mail etc ,and just curious after viewing your pics again is all of your wood going to be fully encapsulated ?
    Last edited by OFFSHORE GINGER; 04-04-2015 at 03:23 PM.

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    Hello Offshore Ginger. You were just the person I hoped would see this. As far as I know we haven't spoken before. Thank you for answering my question. The stringers have three layers of cloth and the floors have two layers. The areas between the balsa and stringers will be sprayed with black gel and eventually will all be flow coated. My next question is about paint. I know that it is expensive. Do you know of a company that produces a quality paint that wont cost a fortune? I'm willing to spend the money to get good products but I don't need anything over the top. Thank you again for taking the time to share your knowledge.
    '73 Hondo Jet, 5.3LS, Borg Warner S475 "MACHINIST MAKE THE WORLD GO ROUND"

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    Quote Originally Posted by sideways_s13 View Post
    Hello Offshore Ginger. You were just the person I hoped would see this. As far as I know we haven't spoken before. Thank you for answering my question. The stringers have three layers of cloth and the floors have two layers. The areas between the balsa and stringers will be sprayed with black gel and eventually will all be flow coated. My next question is about paint.
    Just a few questions what product are you thinking of using for flow coat, and why not just add a pigment to the flow coat ( black ) opposed to spraying Gel , and have you given much thought on what type of paint you just might want to spray , Base Coat / Clear Coat , Imron , Awlgrip , or..............

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    Quote Originally Posted by OFFSHORE GINGER View Post
    Just a few questions what product are you thinking of using for flow coat, and why not just add a pigment to the flow coat ( black ) opposed to spraying Gel , and have you given much thought on what type of paint you just might want to spray , Base Coat / Clear Coat , Imron , Awlgrip , or..............
    I know there are other products but I've been thinking about using duratec on the floors. For the paint I'd like to do a base coat/clear coat. I'm open to suggestions on what products to use. This boat isn't going to be a show stopper by any means. Just something that looks nice and that I can say I did myself. Thank you again for your help. I really do appreciate it.
    '73 Hondo Jet, 5.3LS, Borg Warner S475 "MACHINIST MAKE THE WORLD GO ROUND"

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    Senior Member OFFSHORE GINGER's Avatar
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    Quote Originally Posted by sideways_s13 View Post
    I know there are other products but I've been thinking about using duratec on the floors. For the paint I'd like to do a base coat/clear coat. I'm open to suggestions on what products to use. This boat isn't going to be a show stopper by any means. Just something that looks nice and that I can say I did myself. Thank you again for your help. I really do appreciate it.
    First off my all time favorite paint ( Base Coat / Clear Coat ) is PPG which often can make the worst painter out there look like a seasoned pro and when you mention using Duratec for the floor are you talking about using there Sunshield Topcoat and if so are you going to be spraying Topcoat over Gel between the areas of the Balsa & Stringers because this could , and might be a problem due to all the thickness or mils of material on the surface ( Gel / Sunshield ) causing it to crack ( with time / down the road ) because of the thickness alone or mills .
    Last edited by OFFSHORE GINGER; 04-07-2015 at 04:29 PM.

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    Quote Originally Posted by OFFSHORE GINGER View Post
    First off my all time favorite paint ( Base Coat / Clear Coat ) is PPG which often can make the worst painter out there look like a seasoned pro and when you mention using Duratec for the floor are you talking about using there Sunshield Topcoat and if so are you going to be spraying Topcoat over Gel between the areas of the Balsa & Stringers because this could , and might be a problem due to all the thickness or mils of material on the surface ( Gel / Sunshield ) causing it to crack ( with time / down the road ) because of the thickness alone or mills .
    Holy run on sentence there Batman... Could you break it down another way or re-word it a bit? Trying to follow this thread 'cause I'm dealing with some of the same issues (We have discussed my floor problems and your help has been much appreciated). Could I just roll out a thin layer of resin, then spray the Sunshield? Basically skip the gelcoat step? Could that produce acceptable results?

    Sorry, don't mean to Jack the thread.

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    Quote Originally Posted by OFFSHORE GINGER View Post
    First off my all time favorite paint ( Base Coat / Clear Coat ) is PPG which often can make the worst painter out there look like a seasoned pro and when you mention using Duratec for the floor are you talking about using there Sunshield Topcoat and if so are you going to be spraying Topcoat over Gel between the areas of the Balsa & Stringers because this could , and might be a problem due to all the thickness or mils of material on the surface ( Gel / Sunshield ) causing it to crack ( with time / down the road ) because of the thickness alone or mills .
    That sounds great. I'll be sure to give them a good look when I order the paint. When I said Duratec I was meaning that I would be using their high gloss additive 904-001 mixed with clear gel. I understand what you are saying about too much mil thickness and cracking, but I thought it was common practice to spray gel on the stringers and floors and then top coat over that? I have some black pigment that I can add to a thin coat of resin to "black out" those areas if that would help keep the mil thickness down. I want to do this right so I'm all ears here. Thanks again, your help is invaluable.
    Quote Originally Posted by phughes SS-13 View Post
    Holy run on sentence there Batman... Could you break it down another way or re-word it a bit? Trying to follow this thread 'cause I'm dealing with some of the same issues (We have discussed my floor problems and your help has been much appreciated). Could I just roll out a thin layer of resin, then spray the Sunshield? Basically skip the gelcoat step? Could that produce acceptable results?

    Sorry, don't mean to Jack the thread.
    Hey no problem anything you need to ask about floors and paint is fine with me. I'm trying to learn everything I can.
    '73 Hondo Jet, 5.3LS, Borg Warner S475 "MACHINIST MAKE THE WORLD GO ROUND"

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    Quote Originally Posted by phughes SS-13 View Post
    Holy run on sentence there Batman... Could you break it down another way or re-word it a bit? Trying to follow this thread 'cause I'm dealing with some of the same issues (We have discussed my floor problems and your help has been much appreciated). Could I just roll out a thin layer of resin, then spray the Sunshield? Basically skip the gelcoat step? Could that produce acceptable results?

    Sorry, don't mean to Jack the thread.
    Sure no problem.................. First off you can skip the Gel coat which is something I do not use for floors considering i have only used pigment for color on stringers ( mixed with resin) and in your case seeing that your floor most likely has already been sealed using Pro- Clear and no bare wood is exposed most likely all you would need to do is prep the surface spraying the Sunshield unless you feel the need to apply another thin coat of resin sealing everything & prep prior to spraying . Quick Mention which is ...........................i talked with a rep at a local Boat Co concerning Pro Clear last week and you are one of many who had problems .

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    Senior Member phughes SS-13's Avatar
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    Quote Originally Posted by OFFSHORE GINGER View Post
    Sure no problem.................. First off you can skip the Gel coat which is something I do not use for floors considering i have only used pigment for color on stringers ( mixed with resin) and in your case seeing that your floor most likely has already been sealed using Pro- Clear and no bare wood is exposed most likely all you would need to do is prep the surface spraying the Sunshield unless you feel the need to apply another thin coat of resin sealing everything & prep prior to spraying . Quick Mention which is ...........................i talked with a rep at a local Boat Co concerning Pro Clear last week and you are one of many who had problems .
    So you do remember the issues I have been dealing with. The Pro Clear started to blister and peel so it is all coming off. Sanding and scraping, soon the floor will be clean and I'll be ready to try again. Will say I had a very positive result with the Sun Shield on the dash area. Even with having to block it down and buff it out still think it was worth the effort. One more time, and I can't say this enough... Thank you for your help and guidance, it is much appreciated.
    Last edited by phughes SS-13; 04-08-2015 at 05:15 PM.

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    Quote Originally Posted by phughes SS-13 View Post
    So you do remember the issues I have been dealing with. The Pro Clear started to blister and peel so it is all coming off. Sanding and scraping, soon the floor will be clean and I'll be ready to try again. Will say I had a very positive result with the Sun Shield on the dash area. Even with having to block it down and buff it out still think it was worth the effort. One more time, and I can't say this enough... Thank you for your help and guidance, it is much appreciated.
    Yes I do remember and if you get the time shoot me an E-Mail because I always seem to have problems posting or sending a P M on this site which is the reason for delayed replies . Artie

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    Quote Originally Posted by sideways_s13 View Post
    That sounds great. I'll be sure to give them a good look when I order the paint. When I said Duratec I was meaning that I would be using their high gloss additive 904-001 mixed with clear gel. I understand what you are saying about too much mil thickness and cracking,
    First off I apologize for the mis-understanding...... due to the fact that I did not know that you were planning on using Duratec's 904-001 Clear Hi Gloss Gel Coat Additive which should leave you a very nice and durable finish after all is said and done when blended 1 to 1 considering most people want the richness of being able to see the core / wood opposed to Gel or color and are you really sure that you want that much Black on the floor from the Hull sides to the stringers

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