Anyone ever use RockHard to fill holes???

[CADman_ks]

I was going to the auto parts store to get some Bondo, but then I remembered that I have some RockHard at the house.

Anyone ever use that as a filler for holes, and an agent to fill gaps / level things?

I've never used Bondo before, but RockHard can, well be, hard. I'm just wondering if it's harder than Bondo or if Bondo sands easier than RockHard...

CADman_ks

[AdelaaR]

Since I don't know what you mean by "RockHard", I tried googling for it.
The first entry was a German hard rock music magazine.
The second entry was a brand of erection pills.
The third entry was a brand of helmets.

[CWH&R]

Wood filler

I found the best filler to be the fix it stick at Home depot. They sell it in the plumbing dept. for $8.oo per stick. This works great for filling screw and nail holes.

[CADman_ks]

Since I don't know what you mean by "RockHard", I tried googling for it.
The first entry was a German hard rock music magazine.
The second entry was a brand of erection pills.
The third entry was a brand of helmets.

LOL!!!

That was NOT my intention.

When I posted that, I didn't have the can in front of me, and I could not remember who made the stuff.

It's made by a company called Durham. Here is the link:

http://www.waterputty.com/

Their web site is pretty lame...

CADman_ks

[Rolex]

I use both, but do not like rock hard water putty for speaker building. Bondo is so simple, cures quickly and sands easily. The truth is water putty probably works just fine in that application. I have both on the shelf and grab Bondo for speakers.

[CADman_ks]

I use both, but do not like rock hard water putty for speaker building. Bondo is so simple, cures quickly and sands easily. The truth is water putty probably works just fine in that application. I have both on the shelf and grab Bondo for speakers.

Well, my first Bondo experience wasn't all that great. It just set up so fast, but, rockhard does as well. But, with rockhard, you can mix it and use it in fairly small batches. I think that rockhard is probably a little bit harder to sand, though, like you were saying...

CADman_ks

[CADman_ks]

One thing that Bondo brings to the table, is that it's generally easier to spread than RockHard. RockHard, even when it's first mixed kind of has the consitency of somewhere between sheetrock mud and Play-Do, leaning towards the Play-Do side.

CADman_ks

[---k---]

The few times I used Bondo, I just mixed enough to do a few holes at a time. Maybe a golf ball or so at a time. Just use the amount of hardener that looked right. So I never had a problem with it hardening too fast. The work went pretty fast. I didn't see a downside to mixing extremely small batches.... except I went through the hardener 4x as fast.

[CADman_ks]

The few times I used Bondo, I just mixed enough to do a few holes at a time. Maybe a golf ball or so at a time. Just use the amount of hardener that looked right. So I never had a problem with it hardening too fast. The work went pretty fast. I didn't see a downside to mixing extremely small batches.... except I went through the hardener 4x as fast.

That's exactly what I tried the first time, and I put about a 1/4" line of hardener in there (what the can called for), and it was done in under 3 minutes.

It sure doesn't seem like there's enough hardener to do the pint can that I have, though...

CADman_ks

[AdelaaR]

I use "acryl", a sort of silicone tube for paintwork.
When it needs to be strong I use Tec7, a sort of supersiliconeglue.

[PMazz]

Anything with water in it, especially on MDF, will swell the surrounding MDF and shrink in the filled hole, requiring several coats. Bondo will do it in one pass w/o adding moisture. That said, for small holes I prefer auto body "spot putty". It's solvent based and requires no mixing, sands easily and doesn't shrink.

[JonMarsh]

Good points- thanks Pete.

[CADman_ks]

... That said, for small holes I prefer auto body "spot putty". It's solvent based and requires no mixing, sands easily and doesn't shrink.

GOOD INFORMATION!!

This sounds like the stuff that I really needed. While mixing the Bondo wasn't hard, the open time is so short that working with it is not easy. Mixing in small batches, like grape sized, isn't easy either, because the hardener to putty ratio is easy to get over hardened. At that point, you have an even shorter open time...

CADman_ks

[Hank]

Keep using that 3M Bondo, guys, and the blue painters tape, and... :T

[CADman_ks]

Keep using that 3M Bondo, guys, and the blue painters tape, and... :T

Hank, you don't by chance have some secret affiliation with 3M, do you???

I don't think that I've ever met a 3M product that I didn't like. At the end of the day, they just work...

CADman_ks

[Hank]

CADman, it's no secret around here - I will have worked at 3M for 33 years this July. I try not to be too blatant here about our products, but do have a bit of pride in them. :W

[CADman_ks]

CADman, it's no secret around here - I will have worked at 3M for 33 years this July. I try not to be too blatant here about our products, but do have a bit of pride in them. :W

Cool... 8)

You have my vote...

CADman_ks