Why we DON'T use Bondo on exteriors at Precision Painting

Many painters use Bondo for prep and repair on exeriors. At Precision Painting we do not use Bondo on exteriors, this video explains why and what we do use instead.

[samdog]

This is brand new wood! bondo is great for wood rot on an old house inside for sure and can be useful on exterior in certain spots.

[jonathanmcadams-nxzp]

There are two part expanding epoxies that can be used for exterior wood rot and it lasts at least 30 years because i did it when i was 14 and its still perfectly shaped. Also if you put a space heater on the rot and scrape it out then dab wood epoxy into the rot very hard and get it completely wet or saturated with the epoxy and then let it dry you will be good. Dont use bondo on joints and you will be fine. Saying that you shouldnt use bondo ever and implying it is wrong all the time is overkill. We know you dont use it but it can be used and work properly.
Again just heat the wood rot spot and scrape out the soft rot, then epoxy the wood and satuarate it completely. You must use a two part epoxy. I often use a product from PC Products that is a wood filler but expensive. Then you can sand the epoxy where it overflowed in the rot and fill in the hole with bondo as long as it isnt in a joint. Joints call for a flexable 2 part epoxy called flex tec or dura fix. I have used flex tec on the surface and filled in with bondo wood filler before and it works fine. Obviously its best to replace but we do 100 year old Georgia mansions and heart pine everywhere has to be replaced if necessary but we try to fill and shape much as possible. We use epoxy with heart pine saw dust for filling much of the wood including trim and floors and doors and so on. Dura fix and Flex tec are the best unless you are doing big stuff like us and then getting your own array of 2 part epoxies with different set up times and viscosites and so on is best. We have some 2 part repair epoxy for furniture that sets up in like 7 seconds and will start smoking the minute you mix it and heat up and expand a little then it is fuzed into the wood. And some that is UV activated and then some that is rated for high pressure and some for high heat and so on and so on.
Between Rock Hard Putty and Bondo I go with Bondo when prepped right. Make aure you seal the rot with epoxy and use bondo as a filler only not an adhesive or a structural compnent of the piece in question. Its filler and use it as such to make your project work. Telling people bondo is no good is misleading. It has its place.

[billmadle]

Guys I’ve been a contractor for 36 years from what I see is that’s rough wood meaning 2x8 and you’re trying to get a finish project out of that. The one by eight has been shot up by framing nails. I’ve been around new homes for many years and on all of the homes all the roof framing is done and then they put A-zac or finished pine over that. But, mostly it’s the total house that gets done in framing and then they use A-Zac Which is a white kind of plastic board that would never rot. Personally I feel you’re missing one more layer of wood either one by eight pine. And the pine shot on with finish nails not framing nails and then the small holes with putty right over and the wood would look great paint it. If you’re rough framing wood which that’s what I see is going to get covered with metal cappingThen it doesn’t matter at all if the holes are filled because the metal capping would go on there and then the gutters would go on there which would cover half the board anyway.The the 2 x 8Framing wood is not finished wood and once again it has been Blasted away with framing nails so you can’t get a nice finish appearance out of rough lumber and you would have to sand those holes with whatever you put over it a couple times and you would have to prime that wood, Then give it a couple coats of finish paint exterior then it might look OK but still if it’s rough framing work it’s gonna blister up anyway that’s only for your roof framing. Rough framing wood is your rough framing then you’re finished wood goes over it and or metal capping

[JesusRamirez-hvwj]

You put caulking when putting both fascial boards together. That way caulking really gets inside. And whatever comes out after putting them together you just wipe it rigth away. Also put a nail or screw on bottom to grab both fascial boards together

[dfghdh]

I have a large hole in my siding and don't want to replace it. Is there a filler that can handle temperature changes?

[Mike-qokp]

Polyester filler works fine assuming the substrate is prepped and the applicator knows what he's doing and last the substrate should not be in direct sunlight because it will crack with expansion and contraction. So the title of this video is absolutely incorrect, it can be used on a homes exterior, just not all the time. In special cases it works great.

[mattarena]

this is not a good technique at all DONT do it!i have been painting for 40 years and have my own company, caulking is not an option for patching holes, caulking can not be sanded and is very visible wherever its smeared even with this brush technique he is doing, bondo is not good at all either, bondo is used as a last resort for something very old and beat up it can revive a bit if replacement is not an option. use an exterior patching with just a tiny putty knife with an exterior patching compound but just go over the holes one at a time and put it a little bit above the hole and lightly sand with sanding sponge or lightly with 100 grit as you go while you are already painting. but hey im sure the company does great work overall this certain way for this is not on point but most people wont notice the difference what ever way its done lol.

[dfghdh]

Love perfectionists like this. Most people are hacks just trying to get stuff done and don't care about quality.

[f]

No one spend so many times of process and so much time unless it is your own house.

[saeen]

What about liquid nails instead of caulking?

[Wanderer_]

great but that grade of Dap caulking you are using is very low quality.

[johnp]

paint the fascia boards with boracare before anything, no rot or termites.

[robovillarsvillars]

All that prep and you still see nail holes? No no no!

[mcsqueegee]

That was a really cheap grade of caulk, the normal dap stuff. could be upgraded to elastomeric type, is much better with flexibility & not cracking over time. Also I noticed you were painting the facia in the sun? that can easily be too hot...
but yes, no bondo for the facia butt joints!

[robbiebooth]

Ohhh! I need a few brushes and putty knife to caulk! To think ive just been using my finger and a rag this entire time with the same results! 😂😂😂😂

[CJR]

Heard that. I’m patching some siding with bondo currently instead of replacing the whole board of hardy wood.

[tonyc]

Very good job, great detail. What primer did you use here? 4:10

[Iran-]

What kind of caulk do you use for exterior crack Fascia please?

[ogatkinson]

Dude you are standing in front of new construction and talking about bondo, at least be honest.

[christopheredwards]

Great, "Whoa I did a really good job" impression of someone using a putty knife to fill the nail holes. Definitely me. 😂