DIY Car Paint Job Masking Tips- How To Mask Windshield Molding To Prevent Bridging or Hard Edges


-Hey, this is Donnie Smith
with an ABRN how-to tip. In this video,
we’re going to show you some masking techniques. One of the problems
when masking, for example, a windshield,
is called bridging. That’s whenever
you mask this off. For example, if I just masked
this off to the edge like that, right now there’s still a
gap in between this molding and the paint surface. However, whenever you put your
paint and your primers down, your base coats and your clear
coat, so much mils get there and it kind of fills
in this gap here. It’s called bridging. That’s where your paint surface
bridges to your tape surface. And if that happens,
whenever you go to unmask it, you’re going to leave a really
hard edge where that unmasks. You may even, whenever
you’re pulling it, pull a chunk of
clear off of the car. And if that happens and you
have a chunk of clear that got pulled off
here, you’re going to have to sand and redo this. I’m going to show you a
technique to eliminate that. Now, rather than using
regular masking tape to mask like we’ve shown you, there’s
a couple of options you have. This is a tape made by 3M
for these type of moldings, to mask your trim off. How this works, they’ve
got two different sizes. They’ve got 15 millimeter
and 10 millimeter. And what the difference
is is how thick this plastic strip
here is, right here. Let me show you how this works. We’ll use the 15. This is also going to depend on
how flexible your molding is. This one’s really flexible so
it will be plenty easy to do. I’m just going to tear
a small piece off just give you an example
of how this works. OK, how this works is you
get a hard surface here, which is going to fit
underneath the molding. And then this is
self-adhesive here, and you’re going to stick
that to the windshield. And you want this part to stick
to the windshield right here. So what we’re going
to do is we’re going to slide this underneath. That way, it’s
underneath this molding. And then you’re going to
take this backing off. And now you’re going
to fold this molding up and you’re going to tape it
to the windshield itself. Now what you’ve done is
you’ve built distance in between this molding
and the paint surface. And the paint and clear, it
will fall underneath this. It’s going to go under there. This will eliminate
getting the hard edge. And this is also
eliminating the possibility of it bridging from
this to this piece. Then after you’re done
painting– and of course, on the rest of the
windshield, you would mask from here down
to cover the windshield. Then whenever you’re
done, you take this off. It slides up from
underneath here. After the paint is dried
the next day, take this off. And then this molding, it
falls back on top of the paint, and the paint and
clear is actually underneath the molding. A lot nicer, cleaner
job and, like I said, it eliminates the
possibility of bridging. There’s one more
possibility with a molding that’s flexible like this. You can get some 1/4 inch
rope if you don’t have this. You can fold this back, then you
can place the rope under here where that rope will hold
it up just a little bit off of the paint surface. And then you’ll go ahead and
mask this like you normally would, with that raised
above the paint surface. With that raised above
the paint surface, we’ll go ahead and
mask off to this edge here like we normally would. That way you’ve got
a nice, clean edge where you’re not getting
paint on the molding. And then whenever
you’re done, you just peel this off, have
your nice, clean edge. And then you take your rope
out and again, this molding will fall on top of
the painted surface. The paint and clear is actually
underneath the molding. That’s another method to
eliminate paint bridging. Anyway, that wraps up
this ABRN how-to video.