How to get a Part's surface(Front, Bottom, etc)?

Hi! I'm making a script where you can spray a logo on a part but the thing is I don't know how to make it so that it sprays the logo on the part's surface that you're facing. Can you help me?

This is what I have so far:

local UIS = game:GetService("UserInputService")

local mouse = game.Players.LocalPlayer:GetMouse()

local player = game.Players.LocalPlayer

local character = player.Character

local humanoid = character:WaitForChild("Humanoid")

local SprayPoints = game.Workspace:GetDescendants()

local Equipped = false

local canSpray = true

local spraying = false

local maxDistance = 10

local SpraySound = Instance.new("Sound", script.Parent)

SpraySound.Name = "SpraySound"

SpraySound.SoundId = "https://www.roblox.com/asset/?id=843338638"

UIS.InputBegan:Connect(function(input, gameProcessed)
    if gameProcessed then
        return
    end
    if input.KeyCode == Enum.KeyCode.E and canSpray then
        if Equipped == false then
            Equipped = true
            print("Equipped is ", Equipped)
        else
            Equipped = false
            print("Equipped is ", Equipped)
        end
    end

    mouse.Button1Down:Connect(function()
        if Equipped then
            print("Pressed")
            local target = mouse.Target
            print(target.Name)
            if (character.UpperTorso.Position - mouse.Hit.p).magnitude <= maxDistance and spraying == false then
                canSpray = true
            else
                canSpray = false
            end
            if target and spraying == false and canSpray then
                canSpray = false
                spraying = true
                SpraySound:Play()
                local SprayTexture = Instance.new("Decal")
                SprayTexture.Name = "SprayTexture"
                SprayTexture.Texture = "http://www.roblox.com/asset/?id=4552976698"
                SprayTexture.Parent = target
                spraying = false
                canSpray = true
            end
        else
            print("Can't press")
        end
    end)
end)