Je vaporise avec le vaporisateur.

In French, je only shortens to j’ before a vowel sound or a silent h.

• j’aime because aime starts with a vowel
• j’habite because habite starts with a silent h
• je vaporise because vaporise starts with the consonant sound v

So je vaporise is correct.

Vaporise is the first-person singular present tense form of vaporiser.

The verb pattern is like many regular -er verbs:

• je vaporise = I spray / I am spraying
• tu vaporises
• il / elle vaporise
• nous vaporisons
• vous vaporisez
• ils / elles vaporisent

So je vaporise means I spray or I am spraying, depending on context.

Avec means with.

In this sentence, it introduces the tool or instrument used to do the action:

• Je vaporise avec le vaporisateur.
• I spray with the sprayer / spray bottle.

This is a very common pattern in French:

• J’écris avec un stylo. = I write with a pen.
• Je coupe avec un couteau. = I cut with a knife.

So avec shows what you are using.

They are related, but they are different parts of speech:

• vaporiser = to spray / to mist → a verb
• vaporisateur = sprayer / spray bottle / atomizer → a noun

They come from the same root idea, just like English can have related words such as to spray and sprayer.

So in this sentence:

• vaporise = the action
• vaporisateur = the thing used to do the action

Both are possible, but they mean slightly different things.

• le vaporisateur = the sprayer
• un vaporisateur = a sprayer

Using le suggests a specific sprayer, one already known from the situation or context.

Using un would introduce it as just one sprayer, not a specific one.

So:

• Je vaporise avec le vaporisateur. = I’m spraying with the sprayer.
• Je vaporise avec un vaporisateur. = I’m spraying with a sprayer.

It is grammatically correct, but yes, it can sound a bit repetitive because both words come from the same root:

• vaporise
• vaporisateur

It is a bit like saying I spray with the sprayer.

That said, it can still be natural if the goal is to specify the tool. In everyday French, people might also say:

• J’utilise le vaporisateur. = I’m using the sprayer.
• Je pulvérise avec le vaporisateur. = I spray with the sprayer.
• Je vaporise les plantes avec le vaporisateur. = I spray the plants with the sprayer.

So the sentence is fine, but in real conversation it may sound more natural if there is an object or more context.

Yes, very often vaporiser does take an object, because usually you spray something:

• Je vaporise les plantes. = I spray the plants.
• Je vaporise de l’eau sur les feuilles. = I spray water on the leaves.

But French can also leave the object unstated if it is obvious from context. In that case, je vaporise simply means I’m spraying.

So this sentence is understandable even without saying what is being sprayed.

A simple pronunciation guide is:

zhuh va-po-reez a-vek luh va-po-ree-za-tuhr

A more IPA-style version is roughly:

/ʒə vapɔʁiz avɛk lə vapɔʁizatœʁ/

A few notes:

• Je sounds like zhuh
• vaporise ends with a z sound
• avec is usually pronounced a-vek
• vaporisateur ends with the French -teur, roughly tuhr

There is no special contraction in je vaporise, and no major mandatory liaison here in normal speech.

Yes. The French present tense often covers both meanings that English splits into two forms.

So je vaporise can mean:

• I spray = habitual / general action
• I am spraying = action happening now

Context tells you which one is meant.

For example:

• Chaque matin, je vaporise les plantes. = Every morning, I spray the plants.
• Attends, je vaporise avec le vaporisateur. = Wait, I’m spraying with the sprayer.

Not always. Vaporisateur is a valid word, but the best translation depends on the object.

It can mean things like:

• sprayer
• spray bottle
• atomizer
• sometimes a device that produces a fine mist

In everyday French, people may also use other words depending on the context, such as:

• un spray
• un pulvérisateur
• un flacon vaporisateur

So vaporisateur is correct, but there may be other common choices depending on what kind of sprayer you mean.

Yes, but that means something different.

• Je vaporise avec le vaporisateur. = I spray with the sprayer.
  This focuses on the action and the tool.

• Je me vaporise avec le vaporisateur. = I spray myself with the sprayer.
  Here me means the action is done to yourself.

So adding me changes the meaning. Use it only if you really mean that you are spraying yourself, for example with perfume or water mist.