Underseal won’t flow out of gun

[Piston2022]

Hi

I know brake cleaner , thinner do remove or weaken under-seal or at least I use them to remove unwanted under-seal and also heat if needed

Question is, i want to spray hard to reach areas and the spray comes with a nozzle/ extension but my compressor at 90 psi can’t seem to get the under-seal sucked up and through the pump.

Would you mix thinner or white sprite? Wouldn’t that weaken the underseal

I always put the 1 litre bottle in hot tub for a while so it flows easy from the gun but still won’t flow out of the extended bit


I have one of these guns

https://www.diy.com/departments/us-pro-underbody-c...

[Catnip64]

Which sealer are you looking to spray with this gun?

[Piston2022]

I have these

https://www.amazon.co.uk/Tetraschutz-Application-U...

[Belle427]

Ive always used white spirit, helps to warm the product too in a bucket of hot water, maybe try warming the gun vessel too but thats quite tricky.

[Bluevanman]

The extension tube is for waxoyl type products not underseal and even then you'll probably have to warm the waxoyl up in a bucket of hot water to get it thin enough spray.
I wouldn't attempt to spray underseal through it

[Piston2022]

How would you do hard to reach ares where hand can’t reach?

[steveo3002]

that should spray out the gun without thinning

if you need to use the extension nozzle thats for waxoil type products , you dont underseal inside cavitys etc

[Piston2022]

Waxyoil is the black stuff like bitumen right?

If so you stating you don’t need to spray cavity/ areas one can’t reach?

If so you hat do you use to protect those areas from rust?

[steveo3002]

waxoil /cavity wax is a thinner sometimes clear or semi transparent wax that flows when warm to coat inside a cavity like a sill , mostly sprayed out of those lances

underseal/shutz is thick black goopy bitumen stuff used from a gun like you have to spray under the floor pan etc , often used to hide or cover up badly rusty cars

[steveo3002]

what is it youre trying to do ?

you can get some decent aerosol cans these days , and best use it in the warmer weather not mid winter

[Piston2022]

I am trying to spray rear subframe cavity which Is way too deep/ spray without extension won’t get there

I thought bitumen black stuff is waxyoil, i guess it is mixed with waxyoil

[Piston2022]

steveo3002 said:

waxoil /cavity wax is a thinner sometimes clear or semi transparent wax that flows when warm to coat inside a cavity like a sill , mostly sprayed out of those lances

underseal/shutz is thick black goopy bitumen stuff used from a gun like you have to spray under the floor pan etc , often used to hide or cover up badly rusty cars

The white / transparent oily stuff does same protection? If so what is the point of bitumen?

[steveo3002]

the thick black stuff is typically used to hide /cover an mot rust repair /patch up old bangers

[Piston2022]

Aha, ok got you.

[Peanut Gallery]

Just to add when I was waxyoil sprayed my car I really needed to heat the waxoil, I had a blower heater aimed at the metal 5ltr tin, it flowed and sprayed best when the whole tin was way too hot to touch - I dare say this made things interesting when drips fell down and found skin.

[boyse7en]

steveo3002 said:

the thick black stuff is typically used to hide /cover an mot rust repair /patch up old bangers

I tend to use it inside the arches as it is good for a bit of sound deadening too

[Piston2022]

Peanut Gallery said:

Just to add when I was waxyoil sprayed my car I really needed to heat the waxoil, I had a blower heater aimed at the metal 5ltr tin, it flowed and sprayed best when the whole tin was way too hot to touch - I dare say this made things interesting when drips fell down and found skin.

Oh man

[Jo-say8k]

A can of dinitrol ml or similar with a long extender, I did the full length of my sills so you should be fine for the width of a subframe

[Metric Max]

Stand the product next to the AGA overnight

[ChocolateFrog]

Stick it in a low oven at 100 degrees for an half an hour or so.