Non drip mastic

[Graham_Wright]

My deck overlaps the hull and is bonded to it inside with several layers of GF.
There is a variable gap outside that I tried to fill with mastic. It was not successful as the mastic drooped.

Can anyone recommend a "non droopy" mastic for this job please?

 

[Poignard]

CT1 is quite thick and dries to a hard rubbery constituency. I suggest you contact the CT1 technical department for specific advice.

 

[Graham_Wright]

CT1 is quite thick and dries to a hard rubbery constituency. I suggest you contact the CT1 technical department for specific advice.

The original was CT1 (I think).
I could try supporting it while it cures.

 

[dankilb]

Pure polyurethane (e.g. PU40) might cure quicker than a hybrid like CT1/OB1?

 

[Poignard]

Would it be possible to enlarge the gap to a uniform thickness, sufficient to get the nozzle of the sealant cartridge well into it?

 

[slawosz]

How about well thickened epoxy?

 

[Praxinoscope]

Not so much a plea for a non- drip mastic, but all I want is a mastic that goes where I want it to, not over everything else including me!
But I have found CT-1 to be one of the better mastics.

 

[Graham_Wright]

Would it be possible to enlarge the gap to a uniform thickness, sufficient to get the nozzle of the sealant cartridge well into it?

Big gap in places, which may be the problem

 

[Rappey]

My first question would have been asking what you mean by mastic? Silicon,acrylic,polyurethane, polysulphates, urethane etc?
Mastic seems a very old term that is rarely encountered nowadays.

 

[Daydream believer]

My deck overlaps the hull and is bonded to it inside with several layers of GF.
There is a variable gap outside that I tried to fill with mastic. It was not successful as the mastic drooped.

Can anyone recommend a "non droopy" mastic for this job please?

Mastic should not "droop". I would, respectfully ,( Now edited ) suggest that it is technique. Is there no one who can show you how? Alternatively, get someone to do it for you.
By techique I would imagine that the surfaces are not clean & you are not getting the mastic to adhere to the surfaces correctly as you apply it. Just squirting mastic from a tube into a space expecting it to stick is not the way. It needs to be packed against the surfaces to form the bonds to both sides of the space. If you have a wide gap you can start off by smearing some mastic on to a surface with a putty knife or stick. This has the effect of sort of "priming" the surface. Then when you start to fill the gap the mastic sticks to the surface that you have just applied. Also a mastic gun may not be the right tool. It may need a putty knife & the mastic may need a different method of application.

 

[Graham_Wright]

Mastic should not "droop". I would, respectively, suggest that it is technique. Is there no one who can show you how? Alternatively, get someone to do it for you.
By techique I would imagine that the surfaces are not clean & you are not getting the mastic to adhere to the surfaces correctly as you apply it. Just squirting mastic from a tube into a space expecting it to stick is not the way. It needs to be packed against the surfaces to form the bonds to both sides of the space. If you have a wide gap you can start off by smearing some mastic on to a surface with a putty knife or stick. This has the effect of sort of "priming" the surface. Then when you start to fill the gap the mastic sticks to the surface that you have just applied. Also a mastic gun may not be the right tool. It may need a putty knife & the mastic may need a different method of application.

I imagine by respectively you mean respectfully! I have probably applied as much mastic as any here!
The problem is that the space is deep and, in places, narrow. It is not an important fill, almost just cosmetic. The previous application was a long time ago and looks messy.
I think I will try several layers where the space is deep.

 

[Graham_Wright]

My first question would have been asking what you mean by mastic? Silicon,acrylic,polyurethane, polysulphates, urethane etc?
Mastic seems a very old term that is rarely encountered nowadays.

An ebay search for "mastic" produces ten categories. Should I pass your advice on to them?
I think the description "generic" is probably appropriate.

 

[Pye_End]

Sikaflex?

 

[dankilb]

Not so much a plea for a non- drip mastic, but all I want is a mastic that goes where I want it to, not over everything else including me!
But I have found CT-1 to be one of the better mastics.

All gloop in a tube goes all over the place! Key is to mask up carefully, let it does its worst, accept it’ll look a mess (and maybe extrude) at first, and tidy up after (but before it’s cured).

 

[Rappey]

C

. Should I pass your advice on to them?

If you like ?
I am actually very curious what you squirted in there. The only thing I can think of is polyurethane as that can come out like a weird liquid until it's starts foaming.

 

[Tradewinds]

I'll suggest West Epoxy Six-10. Doesn't droop or sag in my experience YMMV.

 

[Daydream believer]

I imagine by respectively you mean respectfully! p.

Sorry a miss type. Will edit original text

 

[alan_d]

Sikaflex?

Which particular Sikaflex product are you suggesting?

 

[Graham_Wright]

C
If you like ?
I am actually very curious what you squirted in there. The only thing I can think of is polyurethane as that can come out like a weird liquid until it's starts foaming.

It was a l o n g time ago.

It was probably an Arbo product. Removing it was hard work and maybe I should have just tidied it up.

 

[PCUK]

It must be a huge gap, so do it in stages along each side as each side cures until they meet.