Technical, Techniques, Hints, and Tips > Painting, Finishing and Care.

Sand n seal overpainting.

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rich_morris:
Hi All,


I've read through a number of posts now, and read opinions in all sorts of direction on paint and varnish finishes.


I am currently building an Aero-naut classic sport boat, and approaching the stage when I'll need to add some paint and varnish.


The upper hull is mohogany, and I intend to clear lacquer that .
The lower hull is birch ply, and I intend to paint white.


My plan was to put several costs of Deluxe materials Sand n Seal over all the outside surfaces.


Then use an acrylic paint on the lower half and clear acrylic lawyer over the upper half.


The sand n seal says it is ok with acrylic paints.


I was just contemplating using Halfords own paint and laquer.  I had originally planned on using some brush paints.


Are Halfords, or any other acrylic spray products going to cause me any problems, or should I look elsewhere for a trouble free painting and laquer. An 11 year old will be helping/doing, so I want something as simple as possible.


Thanks for any help, or advice.


Rich

DaveM:
Rich
I've not used Sand n Seal myself but I would imagine that it contains a fine powder medium to fill the grain of the wood. Most sanding sealers do. That being the case then I'd advise you strongly to test it out on a scrap bit of the mahogany before you use it on the model. It may spoil the finish by obscuring the wood grain. People who build natural-finished hulls tend to use a much-thinned clear varnish and apply multiple coats, sanding between each one. Laborious but very satisfying when you view the result.

Search the forum for anything containing the words 'Riva' or 'Aquarama' for further info.
DaveM

rich_morris:
Thanks Dave,


As it happens I've already applied sand n seal to the side mahogany skins.
The kit instructions suggested to seal them before gluing them, to prevent glue stains. It looks ok!
It made them curl up the wrong way for skinning the boat, but that's done with now...


Rich

Colin Bishop:
I have been using Sand & Seal and it does dry pretty transparent.  I have just tried some on mahogany sheet and it seems to act very similar to acrylic quick dry matt varnish so I think you will be OK.

Having sealed the hull with Sand & Seal I would be in inclined to carry on with Ronseal Poylurethane varnish which seems to cover just about anything without reacting to it.

https://www.ronseal.com/for-home/wood-care/wood-varnish/ultra-tough-hardglaze-varnish/

Rustins also do something similar:

https://www.rustins.ltd/rustins/our-products/indoor/polyurethane-clear-varnish

Make sure you use the polyurethane type and not the quick dry.

All should be well then!

Colin

Martin (Admin):

Hey Colin!

Your link seems to be for the "interior", 'Ultra Tough Hardglaze Varnish'...

Links to the exterior Varnishes:

Crystal Clear Outdoor Varnish - https://www.ronseal.com/for-home/doors-windows/exterior-wood-varnish/

    All the protection you need without the colour
    A clear finish to let natural wood shine through
    Rainproof in one hour so no need to worry about downpours
    Doesn’t yellow like traditional varnishes

Yacht varnish - https://www.ronseal.com/for-home/doors-windows/yacht-varnish/

    Long lasting protection for outdoor wood
    Waterproof and protects from the sun
    Extremely tough – resists cracking, peeling and blistering
    Highlights wood’s natural colour
    Prevents wood from greying over time



Same for the Rustins:

Quick Dry Outdoor Clear Varnish - https://www.ronseal.com/for-home/doors-windows/yacht-varnish/
 

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