Rubber Coating on the inside of the hull ??

[lennyb]

Once i get my stringers and framing done should i coat it all with spray on rubber? I seen this stuff advertised on TV lately and wonder if it would be benificial to use. It says it seals completely and is 100% waterproof and stays flexible. I think its simular to undercoating but a little thinner for better flow. Just wondering what you guys think about this.

 

[RogersJetboat454]

Re: Rubber Coating on the inside of the hull ??

Once i get my stringers and framing done should i coat it all with spray on rubber? I seen this stuff advertised on TV lately and wonder if it would be benificial to use. It says it seals completely and is 100% waterproof and stays flexible. I think its simular to undercoating but a little thinner for better flow. Just wondering what you guys think about this.

The stuff in a can that advertises not to bother spending thousands on a proper roof repair, when you can spray their rubberized schmutz around the leaking flashing on your chimney..... yeah.... no...

It is just undercoating in a can. Nothing new other than the label. I have a decade old can from Ford with this stuff in it to patch up the undercoating of a vehicle.

A proper stringer, glass, and decking job should negate the use of this stuff.

 

[lennyb]

Re: Rubber Coating on the inside of the hull ??

Thanks to all you guys and the information i've found on here i feel good about being able to do my resto myself. I just thought a little extra waterproofing would hurt but if you guys say "not needed" then im not gonna waste my time / money on it.

 

[Kaplooi]

Re: Rubber Coating on the inside of the hull ??

As long as your final layer of glass is applied using resin containing surfacing wax you should end up with a waterproof seal from the fiberglass alone. Using a rubberized sealant as your air inhibitor on unwaxed resin is a band-aid fix for a bad layup schedule. Or you could use epoxy and not have to worry at all

 

[ezmobee]

Re: Rubber Coating on the inside of the hull ??

friscoboater used that red stuff you put behind tile jobs on his.

 

[zopperman]

Re: Rubber Coating on the inside of the hull ??

"Flex seal" = Plastikote 400 % inflated.

Glass will be just fine. Might want to paint it or gel coat it if anything.

 

[Yacht Dr.]

Re: Rubber Coating on the inside of the hull ??

You really dont need wax or gelcoat/paint for blind glass ( glass that cant be seen ).

And no.. you dont need the rubber coating if your glassing was done correctly.

YD.

 

[chriscraft254]

Re: Rubber Coating on the inside of the hull ??

Guess I will throw this out there, fiberglass is not water proof!

 

[zopperman]

Re: Rubber Coating on the inside of the hull ??

Guess I will throw this out there, fiberglass is not water proof!

that's what I thought too... YD, wouldn't that mean it should be covered in some way with paint or something?

is poly resin waterproof? if so, then the glass keeps it from breaking and the resin provides a barrier and I see what YD is saying...

 

[Yacht Dr.]

Re: Rubber Coating on the inside of the hull ??

Guess I will throw this out there, fiberglass is not water proof!

Properly mixed fiberglass with resin ( epoxy or poly ) is about as water proof as you can get. The boat will outlast its intended life when you do it right. No .. nothing is Water Proof. The water molecule is too small to make that statement absolute.

that's what I thought too... YD, wouldn't that mean it should be covered in some way with paint or something?

is poly resin waterproof? if so, then the glass keeps it from breaking and the resin provides a barrier and I see what YD is saying...

Cured resin ( waxed or unwaxed ) does NOT need a secondary coating. In fact the secondary is only bonded by mechanical means ( sanding/scuffing ). Only visual coatings should be applied. Do you think Gelcoat/paint is going to make your underside better water resistant .. nope .. it wont.

Unless the surface is being bombarded with UV's then its a complete waste of time. Not only that .. but lets say you Hit a log or damage your bottom in any way.. you have No Idea of the extent of the damage from the inside ( because its coated ).

You see us suggesting " well your gonna have to grind off the gel/paint to get to the fiberglass to see if you have structural damage ".

Do not paint or cover the glass Unless needed ..

YD.

 

[chriscraft254]

Re: Rubber Coating on the inside of the hull ??

I would gel coat the bilge, it makes for a much nicer clean surface. It will show you when you have a leak or oil drops etc. All gel coat is is another coating of resin. It will outlast any paint in the long run. Fiberglass is not water proof, but its pretty close,lol Why do you think you see so many old boats with rotted stringers to begin with, its not just from poor workmanship. How do you think water gets into fiberglassed/resin encased stringers?

 

[zopperman]

Re: Rubber Coating on the inside of the hull ??

Properly mixed fiberglass with resin ( epoxy or poly ) is about as water proof as you can get. The boat will outlast its intended life when you do it right. No .. nothing is Water Proof. The water molecule is too small to make that statement absolute.

Cured resin ( waxed or unwaxed ) does NOT need a secondary coating. In fact the secondary is only bonded by mechanical means ( sanding/scuffing ). Only visual coatings should be applied. Do you think Gelcoat/paint is going to make your underside better water resistant .. nope .. it wont.

YD.

thanks for clearing that up...

A lot of wood rots because of thru hull fittings and fasterers... I know my old transom rotted out because of drains in the splashwell not being properly sealed in... or screws in the sole... my transom and stringers were dry as the day the boat was made in the late 60's...