Search the forums

Loading

bondo and azek

woodpeckers's picture

can i use bondo to fill screwholes in azek pvc boards? i made 12 Posts for my porch railing and used pvc glue and ss screws to make my 42" high posts which will be painted. i dont want to see the screwholes showing through the paint. does the bondo stick to pvc?

(post #87159, reply #1 of 10)

You're asking the wrong question.


While bondo will stick to nearly anything, the part that does all the work is an epoxy ... and epoxy does not stand up to sunlight well.


I think you're stuck looking at screws .... unless you want to cut plugs out of azek and super-glue them in place.

(post #87159, reply #3 of 10)

what happens to the epoxy in the bondo? it's not like the stuff is exposed to direct sunlight because it gets covered with paint. wouldn't all the bodywork on cars fail?

(post #87159, reply #4 of 10)

You're correct. If it were exposed to direct sunlight, it would turn yellow, get brittle and crack. If painted you should be fine. If you want to be extra safe, if the paint is white, put on some dark primer first. White paint is still somewhat translucent.

(post #87159, reply #10 of 10)

You don't walk on your car. I have low expectations for the lifespan of any paint applied to a walking surface.

(post #87159, reply #6 of 10)

Technially a two part polyester resin, but it does fine under paint

 

 


Welcome to the
Taunton University of
Knowledge FHB Campus at Breaktime.
 where ...
Excellence is its own reward!

 

 

Oh Well,

We did the best we could...

(post #87159, reply #2 of 10)

I've used exterior spackle to fill the screw holes in AZEK. I did a 17+ foot corner board and counter sunk for a whole lot of screws....took a looong time.  The next 3 corners I attached with 15 Ga SS finish nails. The spackle works as well as it does in wood.


 

(post #87159, reply #5 of 10)

Bond'N'Fill

 

 


Welcome to the
Taunton University of
Knowledge FHB Campus at Breaktime.
 where ...
Excellence is its own reward!

 

 

Oh Well,

We did the best we could...

(post #87159, reply #7 of 10)

Bondo sticks alright, but it takes a few coats of paint to cover the dark spots.  I've heard that thermal cycling of the Azek could loosen the Bondo over time, but haven't seen that problem myself.  Bond'n Fill is designed for this application.


Azek also just came out with (at least I just found out about) a new plug system.  It's a bung cut from Azek, sized to fit the hole left by a trim head screw. 

(post #87159, reply #8 of 10)

I used a high quality urethane caulking to fill them. It stays flexible and is super sticky.

I think you want something that isn't so hard. You are just filling holes.

 

"There are three kinds of men: The one that learns by reading, the few who learn by observation and the rest of them have to pee on the electric fence for themselves."
Will Rogers


Edited 7/13/2009 5:48 pm by popawheelie

______________________________________________________________ ______________________________________________________________ There are three kinds of men: The one that learns by reading, the few who learn by observation and the rest of them have to pee on the electric fence for themselves. Will Rogers

(post #87159, reply #9 of 10)

This is the way to do it, only drawback is it is an $80 box of screws.
 
Set the screw. Set the plug. You're all set!






Product Description:

The FastenMaster Cortex Concealed Fastening System is the fastest, easiest way to conceal the fastener heads when installing AZEK® Trim.


Set the screw. Set the plug. You're all set!






Product Description:

The FastenMaster Cortex Concealed Fastening System is the fastest, easiest way to conceal the fastener heads when installing AZEK® Trim.