Decals in character not responding to change in transparency?

Hey everyone, I'm trying to change the Transparency property of some decals in my character but they don't seem to respond to the change in the transparency property. I've had this issue with other things several times but have got around it but I don't know how to get around this.

My function (all variables are accounted for):

function transparent(value)
    if player.Character:FindFirstChild("Chest") == nil then return end
    for i,v in pairs(player.Character.Chest.Middle:GetChildren()) do
        if v:IsA("Decal") then
            repeat v.Transparency = value until v.Transparency == value
        end
    end
end

How do I get decals in the character to respond to the change in the transparency property?

Any help is appreciated, thanks!