What primer for rustoleum paint on fiberglass hull?

[bzajdek]

I will be sanding my fiberglass trihull with 120grit on my air sander then up to 220 but would there be any benefit of using primer under the non-marine rustoleum paint. The boat was previously painted and its in rough cosmetic shape, there are runs on the hull and cracks and slight peeling in several spots. I think a sandable primer might fill in some imperfections. I do not plan on sanding the outer hull down to fiberglass. Rustoleum has two primers one for aluminum, and the other for rusty metal. I think both of these would not be appropriate for fiberglass. Maybe oil based kilz primer would work?

 

[Bondo]

Re: What primer for rustoleum paint on fiberglass hull?

Ayuh,...

The grey Rustoleum Primer will work Just Fine for what you need...

 

[northrivergeek]

Re: What primer for rustoleum paint on fiberglass hull?

I will be sanding my fiberglass trihull with 120grit on my air sander then up to 220 but would there be any benefit of using primer under the non-marine rustoleum paint. The boat was previously painted and its in rough cosmetic shape, there are runs on the hull and cracks and slight peeling in several spots. I think a sandable primer might fill in some imperfections. I do not plan on sanding the outer hull down to fiberglass. Rustoleum has two primers one for aluminum, and the other for rusty metal. I think both of these would not be appropriate for fiberglass. Maybe oil based kilz primer would work?

DO NOT, I REPEAT DO NOT use rustoleum, kilz, or any other type paint on a fiberglass boat! You Will be doing it again about the time you make one pass down the lake if your talking about the bottom of the boat! .. if you talking about the top ABOVE the water line, your best be is to get removall 620 http://www.dtep.com/removall.htm to take off the old paint.

Then after you remove the paint, wet sand the boat area that removed the paint with 300, and then 600 grit, then fill any gouges etc with epoxy filler such as Interlux InterProtect Watertite Epoxy Filler , then sand smooth.

After than you can the paint if its above water line with epoxy primer, then base coat or urethane auto paint, then clear coat with2k clear urethane these need to be sprayed on with air sprayer.

Or you can use Awlgrip, or Interlux paints, either top coat paint for above water line or bottom paint for below the water line, but you still need to prime with the primer form the brand of paint you intend to use for top coat, dont mix brands.

The awlgrip and interlux are not cheap, but if you wont the longest lasting paint that you can do with brush .. use one of these two brands. If you try and skimp on painting a boat it will soon look like crapola, and you will be doing it again or selling or giving to someone else!

 

[bzajdek]

Re: What primer for rustoleum paint on fiberglass hull?

the topcoat is going to be rustoleum proffesional almond and I wasn't sure what to prime with if any at all. This will be on the exterior hull and see trailered salt water use. The boat has been painted already and it's a 12' trihull skimmar. Never seen anyone with that brand boat, it looks like a whaler copycat but single hull.

 

[sschefer]

Re: What primer for rustoleum paint on fiberglass hull?

the topcoat is going to be rustoleum proffesional almond and I wasn't sure what to prime with if any at all. This will be on the exterior hull and see trailered salt water use. The boat has been painted already and it's a 12' trihull skimmar. Never seen anyone with that brand boat, it looks like a whaler copycat but single hull.

If you take all the old paint off down to the gel coat you do not need a primer above the waterline. You don't need a barrier coat primer below the water line unless you plan on leaving it in the water for more than 72 hours at a time.
To get the best results from you Rustoleum Marine paint you will need to get that old paint off first. Priming over bad paint is a waste of time. Since you didn't paint it the first time you don't know how well it was preped or what type of paint it was. Your options are to take a chance or take your time and do it right.
Rustoleum Marine is fine, regular Rustoleum would not be my choice. They wouldn't make a marine product if the regular stuff was o.k. to use.

 

[tritanusa]

Re: What primer for rustoleum paint on fiberglass hull?

I painted a 15ft Tri-Hull both above and below the waterline with Oil Based Rustoleum Enamel and ran up and down the lake for 2 seasons and even ran it up on sand a few times. No problems at all and I spent about $50.00 total on materials. In freshwater you don't have to worry about the stuff that gets on a saltwater boat. Proper care should be taken but like I said. I did it.. I used it and it came out great.

DO NOT, I REPEAT DO NOT use rustoleum, kilz, or any other type paint on a fiberglass boat! You Will be doing it again about the time you make one pass down the lake if your talking about the bottom of the boat! .. if you talking about the top ABOVE the water line, your best be is to get removall 620 RemovALL to take off the old paint.

Then after you remove the paint, wet sand the boat area that removed the paint with 300, and then 600 grit, then fill any gouges etc with epoxy filler such as Interlux InterProtect Watertite Epoxy Filler , then sand smooth.

After than you can the paint if its above water line with epoxy primer, then base coat or urethane auto paint, then clear coat with2k clear urethane these need to be sprayed on with air sprayer.

Or you can use Awlgrip, or Interlux paints, either top coat paint for above water line or bottom paint for below the water line, but you still need to prime with the primer form the brand of paint you intend to use for top coat, dont mix brands.

The awlgrip and interlux are not cheap, but if you wont the longest lasting paint that you can do with brush .. use one of these two brands. If you try and skimp on painting a boat it will soon look like crapola, and you will be doing it again or selling or giving to someone else!

 

[ezmobee]

Re: What primer for rustoleum paint on fiberglass hull?

Thanks for the info tritanusa but we'd rather you didn't dig up 4 year old threads.

 

[Bondo]

Re: What primer for rustoleum paint on fiberglass hull?

DO NOT, I REPEAT DO NOT use rustoleum, kilz, or any other type paint on a fiberglass boat! You Will be doing it again about the time you make one pass down the lake if your talking about the bottom of the boat! ..

Ayuh,... I know this is an antique thread, but I gotta say,....

I've got hulls, painted with plain ole Rustoleum industrial enamel that have well over 10 years on 'em, 'n None of 'em had the paint peel off...
Above, nor below the waterline...

Actually, for the mild conditions of the water here, Rustoleum enamel is a Preferred bottom paint...
It's so slick, the minimal growth slips right off, runnin' across the pond...

Durability of paint is more 'bout how it's put on, than where it's put....

 

[Woodonglass]

Re: What primer for rustoleum paint on fiberglass hull?

AMEN to That ^^^^^

 

[tritanusa]

Re: What primer for rustoleum paint on fiberglass hull?

Sorry about that. I didn't check the date until I posted it. I am new here but people are going to find this post like I did and think that Rustoleum can't be used. Is there a way to raise the post from the dead? I do want people to know that if a person wants a professional finish and extreme durability they won't look at Rustoleum but use Interlux, Petit or something similar, but for people on a budget it worked for me.

Thanks for the info tritanusa but we'd rather you didn't dig up 4 year old threads.

 

[obiewan]

Re: What primer for rustoleum paint on fiberglass hull?

just like I did, thanks for the post.

 

[happyhitter]

Re: What primer for rustoleum paint on fiberglass hull?

Rustoleum is an extreemly durable paint as I and others use it on our plow truck (plow frames and the plows themselves) at our towns highway dept where i work. The only thing that bothers it is the sand from previous plow runs that gets picked up and rolls off the plow and wings and kindof wears it down. Really looking forward to using it on the sides of my hull. Im thinking that if hull gets prepped rite and primered and color applied correctly it should turn out great with a fantastic shine and no sags etc. I do plan on contacting the mfg. prior to painting tho.

 

[Tail_Gunner]

Re: What primer for rustoleum paint on fiberglass hull?

Well im going to jump here...once a very prominent person in the indrustry pointed out to me gel coat once cleaned and prepped really does not need a primer it boand quite nicely by itself. And it does.

 

[Bondo]

Re: What primer for rustoleum paint on fiberglass hull?

Well im going to jump here...once a very prominent person in the indrustry pointed out to me gel coat once cleaned and prepped really does not need a primer it boand quite nicely by itself. And it does.

Ayuh,.... I can agree with that,...

But,....
Any repairs done, get primed in the fairin', 'n sandin' process anyways,...
'n some paints, not necessarily Rustoleum, look Soo much better if ya have a solid single color base to shoot it on....
Aka: Primer....

 

[Tail_Gunner]

Re: What primer for rustoleum paint on fiberglass hull?

Ayuh,.... I can agree with that,...

But,....
Any repairs done, get primed in the fairin', 'n sandin' process anyways,...
'n some paints, not necessarily Rustoleum, look Soo much better if ya have a solid single color base to shoot it on....
Aka: Primer....

Yep agreed...but if you take the time to fair and sand rather that priming well your a few hours ahead of the game..And any short cuts that eliminate sanding...I'm ALL IN..

Did i ever tell you sanding actually stunt's manhood...Kill's brain cell's and is considered un PC...

 

[nelbo52]

Re: What primer for rustoleum paint on fiberglass hull?

I have a 16ft fiberglass boat and needs to be repainted (12inch strip above the waterline to the top of the gunnel around the whole boat). The current factor paint is faded and looks like hell. What method should i take in the repainting process? The area i am painting is in good shape with no areas that need to be repaired and filled with epoxy. I purchased Rustolem non-marine oil based paint. If I properly sand and clean surface, would i even need to prime, based on the existing factory coat? Like i said, the surface that i would paint is fadded and has no shine. So i am guessing the gel coat has been fadded down to nothing. Ive used rustolem before on workbenches and boat interiors before, and holds up great! Im not going for a "show room" quality job, but something that would be durable and looks better than what it is now. I would use a foam brush in appling the paint, and apply roughtly 3 coats. Any help and tips would be great!

Thanks

 

[ezmobee]

Re: What primer for rustoleum paint on fiberglass hull?

I didn't prime mine and the paint fell off. Prime. It's the best way to ensure good adhesion. Scuff it up thoroughly, prime, sand that as directed, then top coat. I'd recommend foam rollers as opposed to brushes. They work great and left mine with gloss so nice it looked sprayed (ya know, until it fell off :facepalm

 

[Tail_Gunner]

Re: What primer for rustoleum paint on fiberglass hull?

I didn't prime mine and the paint fell off. Prime. It's the best way to ensure good adhesion. Scuff it up thoroughly, prime, sand that as directed, then top coat. I'd recommend foam rollers as opposed to brushes. They work great and left mine with gloss so nice it looked sprayed (ya know, until it fell off :facepalm

Did you scuff lightly sand prior to paint...What type of paint

 

[ezmobee]

Re: What primer for rustoleum paint on fiberglass hull?

Did you scuff lightly sand prior to paint...What type of paint

Scuffed the heck out of it. Petit Easypoxy.

 

[Woodonglass]

Re: What primer for rustoleum paint on fiberglass hull?

I have a 16ft fiberglass boat and needs to be repainted (12inch strip above the waterline to the top of the gunnel around the whole boat). The current factor paint is faded and looks like hell. What method should i take in the repainting process? The area i am painting is in good shape with no areas that need to be repaired and filled with epoxy. I purchased Rustolem non-marine oil based paint. If I properly sand and clean surface, would i even need to prime, based on the existing factory coat? Like i said, the surface that i would paint is fadded and has no shine. So i am guessing the gel coat has been fadded down to nothing. Ive used rustolem before on workbenches and boat interiors before, and holds up great! Im not going for a "show room" quality job, but something that would be durable and looks better than what it is now. I would use a foam brush in appling the paint, and apply roughtly 3 coats. Any help and tips would be great!

Thanks

R U sure it's Paint and Not oxidized Gelcoat. Most boats from the factory are Gelcoat Not Paint! If you want to paint over the gelcoat then You must wash it thoroughly then wipe it all down with acetone. the Last link in my signature below has some good info on how to paint your boat using Majic Paint which is basically the same as the Rustoleum paint. I would also recommend using the hardener and I Always recommend primer for any paint job.