Sealing Balsa & Ply

Started by Treforissa
14 replies 42 likes Last activity: 3 years ago
#15

Sealing Balsa & Ply

€26,50 here, tax included Rod. Still worth every cent.
No hardener, no pong no mess. People friendly😊
Cheers, Doug😎
Young at heart 😉 Slightly older in other places.😊 Cheers Doug
#14

Sealing Balsa & Ply

CAN$32 here+13% tax. My 1st bottle was $35 18mo ago
VA3ROD
#13

Sealing Balsa & Ply

Colin, That is my choice since discovering Ezekote some years ago.
Fortunately I can get mine here in Germany from Krick.
I thin it with ~20% water so that it soaks into the wood.
Especially for balsa, soaks in and strengthens it.
Then a coat or two of neat Ezekote, no glass on ply, maybe tissue inside and out on balsa for added 'ding' resistance.

Cheers, Doug😎
Young at heart 😉 Slightly older in other places.😊 Cheers Doug
Liked by Len1 and Rookysailor
#12

Sealing Balsa & Ply

Or you could seal using ezekote water thin-able resin and fine glass cloth which is odourless, colourless and dry enough to paint over in 30 mins with any type of paint without getting a reaction.
Cheers Colin.
Fair winds and calm waters,
COLIN.
Liked by Len1 and RNinMunich and
#11

Sealing Balsa & Ply

Sorry.. There is a PS to my last Post..
After applying the tissue and dope, you will have to apply another 3 coats of the 50/50 Dope/Thinners concoction, and of course rubbing down between coats, just to give the new applied coat a "key".. Once completed , a paint of your choice can be applied, I tend to use Acrilic paint from Halfords, starting with a couple of coats of Grey primer, rubbing down between all coats, then apply colours of your coice, if more than one coat is required, dont forget to rub it down for next coat to have a key..

ATB Muddy..
Liked by Len1 and Colin H
#10

Sealing Balsa & Ply

HEllo... Sealing Balsa wood or Ply..
Balsa I have always given the wood about 6 coats of Cellulose Dope but thinned 50/50 with Cellulose Thinners available from most car Paint supplies/Motor Factors, The Thinners is not cheap. That is for sealing Balsa, but to help strengthen the Balsa Use about 3 coats of 50/50 dope /thinners, then apply some Medium grade Tissue Paper as was/is used by aero modelers.
Place the Tissue on the pre-treated wood and paint over and into the tissue , just like hanging wallpaper, Dont have any "Cut" joints, tear the paper to size, the teared joints will be near to invisable apon completion of the dopeing process..
Good luck, and dont forget a mask, the thinners and Dope can be very strong in the odure range. Do it outside or in a drafty place..
ATB Muddy..
Liked by Len1 and Colin H
#9

Sealing Balsa & Ply

This I use on my projects before paint but as already said each to there own
Liked by Len1 and roycv and
#8

Sealing Balsa & Ply

Hi John if you are using car colour acryllics from Halfords you are supposed to finish the spraying off with the clear spray, this hardens the finished surface.

When all hardened off, for hulls, I usually apply a quality furniture polish to finish. Many of my models have survived for 10 / 20 years without any attention.

regards
Roy
Liked by Len1 and jumpugly and
#7

Sealing Balsa & Ply

hi there

I am in the camp of the cellulose sand n sealer along with the acrylic sealer as well. In some extreme cases, I will go in with an epoxy resin. Thinned down, to allow it to soak into the balsa wood.

I have found that the cellulose gives a harder finish and is more 'shall we say' 'ding' resistant than the acrylic. The acrylic does tend to be a bit softer - as you can sometimes (if you stick your nail into it) it will leave a mark.

The epoxy can give you a really hard finish The only thing I can think of on the minus side - is to be careful of when you purchase your sand n sealer, there are brands on the market which are used in wood working, as in building furniture and soforth. This has a slight wax in it.

John
Liked by Len1 and AlessandroSPQR and
#6

Sealing Balsa & Ply

My preference is for oil based paints.
Prime with ordinary wood primer (oil based), rub down with fine sandpaper and give a second coat. Then go ahead with undercoats, gloss coats etc.
OR, after the first primer, rub down then go ahead with spray car primer (Eg Halfords grey or red)
OR, prime with Halfords spray car primer, rub down, give second coat primer, rub down, then top coats.
If you prefer to use acrylic paints I suggest watering down the first coat, then rub down, then second coat (also watered down). I don't know how car primer will take to this.
OR, just varnish, rub down, varnish, rub down, repeat, repeat, repeat.
Hope this helps
😉
Liked by AlessandroSPQR and hermank and
#5

Sealing Balsa & Ply

Hi there and welcome aboard Treforissa!
I like to use a light coat of clear spar varnish. I find it is a big help on balsa as serves to stiffen it quite a bit. It's also good on plywood. Even one coat is a help. A little light sanding and it's ready for car primer which will cover pretty much anything. Sanding sealers are also a great idea as Colin mentioned below. Enjoy the build!
Liked by Len1 and AlessandroSPQR and
#4

Sealing Balsa & Ply

Roy I have never had a reaction from the primer or paint over the cellulose sealer.
Whereas you could get reactions from putting cellulose over any other type of paint.
My wife informed me that the only time a reaction over cellulose would be if it had been contaminated by a silicone based paint which can cause reaction on all types of paint. ( by the way she was a paint mixing specialist for automotive paint).
Cheers Colin.
Fair winds and calm waters,
COLIN.
Liked by Len1 and AlessandroSPQR
#3

Sealing Balsa & Ply

Hi Colin H remind me, can you put car primer (it maybe Halfords acrylic) onto sanding sealer, which is cellulose?

I have had some clashes myself! Always a bit wary, I often use Acrylic on enamel.

Roy
Liked by Len1 and AlessandroSPQR and
#2

Sealing Balsa & Ply

Good afternoon Treforissa,
You will probably get different options on here as modellers we all have our own preferences.
My preference is to use Humbrol cellulose sanding sealer on wooden parts that need to be painted, regardless of the type of paint used.
This has worked for me for the last 50 plus years without any issues.
Hopefully this will help you decide.
Cheers Colin.
Fair winds and calm waters,
COLIN.
Liked by Len1 and AlessandroSPQR and
#1

Sealing Balsa & Ply

Hi All, I know this is a question that has been asked many times but I don't seem to be able to find definitive advice. At 69 years old my browsing skills are limited. Here goes.
Just building my first boat after recently retiring. It's a Dumas PT212. The hull and many parts are plastic but there is also ply and balsa involved.
My question is this: What can I use to seal the wood components prior to using car primer on all the components?
I have read many ideas on this and am totally confused.
I am UK based.
Liked by Len1 and flaxbybuck and

Sign in to add to this thread.

Delete this post?

It will be removed from the site.

Discard this draft?

Your draft will be deleted and cannot be recovered.

You have an unfinished draft

What would you like to do with it?